Academic literature on the topic 'Exact sequences. eng'

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Journal articles on the topic "Exact sequences. eng"

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LÜ, JIA-FENG, and MIAO-SEN CHEN. "ON A SPECIAL CLASS OF EXACT SEQUENCES." Journal of Algebra and Its Applications 10, no. 05 (2011): 915–30. http://dx.doi.org/10.1142/s021949881100504x.

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The notion of good exact sequence is introduced, which is a special class of exact sequences including split exact sequences as special examples. Several criteria characterizing good exact sequences are given. In particular, we prove that the exact sequence ξ: 0 → K → M → N → 0 is good if and only if the Horseshoe Lemma is true in the "minimal version" with respect to ξ. We also give a lot of nontrivial examples of good exact sequences via "Koszul" objects. Moreover, some applications of good exact sequences are also provided in the end.
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Bennis, Driss, J. R. García Rozas, Lixin Mao, and Luis Oyonarte. "On Proper and Exact Relative Homological Dimensions." Algebra Colloquium 27, no. 03 (2020): 621–42. http://dx.doi.org/10.1142/s1005386720000516.

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In Enochs’ relative homological dimension theory occur the (co)resolvent and (co)proper dimensions, which are defined by proper and coproper resolutions constructed by precovers and preenvelopes, respectively. Recently, some authors have been interested in relative homological dimensions defined by just exact sequences. In this paper, we contribute to the investigation of these relative homological dimensions. First we study the relation between these two kinds of relative homological dimensions and establish some transfer results under adjoint pairs. Then relative global dimensions are studie
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Hernandez, L. J., and T. Porter. "Global analogues of the Brown–Grossman proper homotopy groups of an end." Mathematical Proceedings of the Cambridge Philosophical Society 104, no. 3 (1988): 483–96. http://dx.doi.org/10.1017/s0305004100065671.

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AbstractThe Brown–Grossman proper homotopy groups at an end of a locally compact Hausdorff space, X, were introduced by E. M. Brown in 1974. In this note we define and study ‘global’ versions of these groups and compare these global groups with the groups ‘at infinity’. We also obtain several interlocking exact sequences relating these groups with the Hurewicz and Steenrod homotopy groups of X.
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HUNG, CHIN-YI, ZICONG ZHOU, YUAN-SHIN YOUNG, and FANG-TING LIN. "EVALUATING MEAN INTRINSIC CURVATURE OF DISORDERED SEMIFLEXIBLE BIOPOLYMERS." International Journal of Modern Physics B 26, no. 24 (2012): 1250131. http://dx.doi.org/10.1142/s0217979212501317.

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We study two-dimensional disordered semiflexible biopolymers with finite mean intrinsic curvature (MIC). We find exact distribution function of orientational angle for the system with short-range correlation (SRC) in intrinsic curvatures. We show that with a finite MIC, our theoretical end-to-end distances can be fitted well to some experimental data of DNA with long-range correlation (LRC) in sequences. Moreover, we find that the variance of the orientational angle has the same power-law behavior as that of the bending profile for DNA with LRC in sequences. Our results provide a way to evalua
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PROSPERI, MATTIA C. F., LUCIANO PROSPERI, REBECCA R. GRAY, and MARCO SALEMI. "ON COUNTING THE FREQUENCY DISTRIBUTION OF STRING MOTIFS IN MOLECULAR SEQUENCES." International Journal of Biomathematics 05, no. 06 (2012): 1250055. http://dx.doi.org/10.1142/s1793524512500556.

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This work investigates frequency distributions of strings within a text. The mathematical derivation accounts for variable alphabet size, character probabilities, and string/text lengths, under both the Bernoullian and the Markovian model for string generation. The analysis is limited to the set of non-clumpable strings, that cannot overlap with themselves. Two formulae (exact and approximated) are derived, calculating the frequency distribution of a string of length m found inside a text of length n (with m < n). The approximated formula has a constant complexity (in contrast to an exponen
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Cooke, Howard J. "Telomeres of the human X and Y chromosomes." Development 101, Supplement (1987): 101–6. http://dx.doi.org/10.1242/dev.101.supplement.101.

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Analysis of the nature of the DNA sequences at the telomeres of the short arms of the human sex chromosomes suggests parallels with the structures found at telomeres of a number of lower eukaryotes. The exact nature of the end of the DNA has not yet been established but it is clear that there are multiple levels of variability both between and within individuals in this region of the genome.
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Lamppa, G. K., G. Morelli, and N. H. Chua. "Structure and developmental regulation of a wheat gene encoding the major chlorophyll a/b-binding polypeptide." Molecular and Cellular Biology 5, no. 6 (1985): 1370–78. http://dx.doi.org/10.1128/mcb.5.6.1370.

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A genomic clone for a major chlorophyll a/b-binding polypeptide of the light-harvesting complex has been sequenced from wheat. This gene, whAB1.6, encodes a 70-nucleotide 5'-nontranslated spacer, a 34-amino-acid NH2-terminal extension, i.e., the transit peptide, and a mature coding protein of 232 amino acid residues. The exact molecular weight of the precursor polypeptide is 28,560. The transit peptide is basic and is rich in serines. No intervening sequences are found in this gene. The transcription start site of the whAB1.6 gene occurs at AAAC as determined by S1 nuclease analysis. Putative
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Lamppa, G. K., G. Morelli, and N. H. Chua. "Structure and developmental regulation of a wheat gene encoding the major chlorophyll a/b-binding polypeptide." Molecular and Cellular Biology 5, no. 6 (1985): 1370–78. http://dx.doi.org/10.1128/mcb.5.6.1370-1378.1985.

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A genomic clone for a major chlorophyll a/b-binding polypeptide of the light-harvesting complex has been sequenced from wheat. This gene, whAB1.6, encodes a 70-nucleotide 5'-nontranslated spacer, a 34-amino-acid NH2-terminal extension, i.e., the transit peptide, and a mature coding protein of 232 amino acid residues. The exact molecular weight of the precursor polypeptide is 28,560. The transit peptide is basic and is rich in serines. No intervening sequences are found in this gene. The transcription start site of the whAB1.6 gene occurs at AAAC as determined by S1 nuclease analysis. Putative
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Newcombe, H. B., M. E. Fair, and P. Lalonde. "Discriminating Powers of Partial Agreements of Names for Linking Personal Records." Methods of Information in Medicine 28, no. 02 (1989): 92–96. http://dx.doi.org/10.1055/s-0038-1635548.

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Abstract:The preceeding paper examined the logical basis of an exact way of calculating the discriminating powers of people’s names when they only partially agree. The method has application to automated file searching and record linkage. The present account describes an empirical test of the approach. Use is made of some 2000 comparison pairs of male given names, obtained as a byproduct from an earlier linkage study. The test shows that exact value-specific ODDS can indeed be calculated for common names when compared with their accepted synonyms (e.g. JOSEPH versus JOE). Moreover, the use can
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Nandor, M. J. "Delving Deeper: Simple Recurrence Relations, Proper Guessing, and Closed-Form Solutions." Mathematics Teacher 99, no. 4 (2005): 292–95. http://dx.doi.org/10.5951/mt.99.4.0292.

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In reading the February 2004 issue of the Mathematics Teacher, I found the wonderful “Delving Deeper” article “Fibonacci and Related Sequences,” by Richard Askey. At the end, in the editors' note, the question was posed whether Fibonacci numbers can be found in a closed form. As it happened, I was teaching that exact topic in my discrete mathematics class at the time. Ever since taking discrete mathematics in college, recurrence relations have fascinated me, and the derivation of a functional form of the Fibonacci sequence is just one great example of how recurrence relations can be used, even
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Dissertations / Theses on the topic "Exact sequences. eng"

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Galão, Paulo Henrique. "Cálculo de grupos de homotopia dos grupos clássicos /." São José do Rio Preto : [s.n.], 2008. http://hdl.handle.net/11449/94210.

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Orientador: João Peres Vieira<br>Banca: Ermínia de Lourdes Campello Fanti<br>Banca: Denise de Mattos<br>Resumo: Este trabalho tem como objetivo principal o cálculo do grupo de homotopia de alguns grupos clássicos, como o grupo das rotações do espaço Euclidiano Rn, SO(n), o grupo unitário U(n), seu subgrupo especial unitário SU(n) e o grupo simpléetico Sp(n). Para esses cálculos usaremos seqüências exatas e propriedades relacionadas à fibrados.<br>Abstract:The main purpose of this work is to calculate homotopy groups of some classical groups as the rotation groups of the euclidean space Rn, SO(
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Books on the topic "Exact sequences. eng"

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Gilmore, Camilla. Approximate Arithmetic Abilities in Childhood. Edited by Roi Cohen Kadosh and Ann Dowker. Oxford University Press, 2014. http://dx.doi.org/10.1093/oxfordhb/9780199642342.013.006.

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This article reviews recent research exploring children’s abilities to perform approximate arithmetic with non-symbolic and symbolic quantities, and considers what role this ability might play in mathematics achievement. It has been suggested that children can use their approximate number system (ANS) to solve approximate arithmetic problems before they have been taught exact arithmetic in school. Recent studies provide evidence that preschool children can add, subtract, multiply, and divide non-symbolic quantities represented as dot arrays. Children can also use their ANS to perform simple ap
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Book chapters on the topic "Exact sequences. eng"

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"female. One was attending college part-time and was 29 years of age, single, and a dental technician. The other was 25, single, a translator and secretary, and an English literature graduate from Damascus University. The other two interview-ers were male. One studied English literature at the University, managed his fam-ily farm property, was 27 and was single. The fourth also studied English literature at the University and was 22. All four were middle class. The Syrian compliment/compliment responses were not audiotaped. The Syrian interviewers reported that tape recorders were likely to make the interviewees feel uncomfortable; that, in general, Syrians are not familiar with the practice of conducting sociological or sociolinguistic studies about themselves; and that the tape recording would be culturally inappropriate. The Syrian interviewers praised 32 recipients, 20 males and 12 females, on physical appearance, on personality traits, or on a skill or job; listened to the responses; responded in turn; and after the interaction was completed, wrote down what was said. In some cases, the interviewers felt uncomfortable complimenting a person of a different gender or a person that was older. In these cases, they observed others giving and respond-ing to compliments and wrote down what was said. These observations resulted in an additional 20 compliment/compliment response sequences. In 7 cases, males were complimented, and in 13 cases, females were complimented. These proce-dures resulted in naturalistic data and yielded 52 Syrian compliment/compliment responses from 52 recipients, 27 males and 25 females. To insure the accuracy of the transcriptions, the Syrian interviewers were trained by one of the researchers. The trainer instructed them (l) to write down the exact words used in the complement/compliment response interaction, and (2) to do so as soon as possible after the interaction took place. In addition, the trainer gave each interviewer note cards and instructed them to write each interaction on a separate card. The trainer met with the interviewers at least once a week. At these meetings, the interviewers reported on their progress and the trainer again emphasized the importance of recording the interactions verbatim. To native speakers of English, recalling compliment responses word-for-word may seem difficult, but the task is less difficult for native speakers of Arabic. Many of the Syrian utterances consist of set formulas. The Syrian interviewers would remember the responses because they exist as formulaic chunks of discourse. The potential for varying the formulas is minimal. For the non-formulaic responses, it is possible that an interviewer might have made a minor change in the wording. However, if such a change occurred, the wording of the compliment response would still be an appropriate Syrian response to the situation. The Arabic compliments/compliment responses were translated into Eng-lish, but the primary analysis was based on the Arabic transcripts, not the English translations." In Pragmatics and Discourse. Routledge, 2005. http://dx.doi.org/10.4324/9780203994597-44.

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"make a telephone call once a day for 5 days when they the two paradigms. Specifically, the exact motoric re-associated the activity with other routine daily events quirements of many naturally occurring intentions (so-called "conjunction" cues) than when internal or (e.g., "buy birthday present") may not be sufficiently other external cues (e.g., diaries) were used. The exact well specified at encoding (or throughout the role of daily structure in the fulfilment of delayed retention interval), to allow the representation of these intention tasks in young and older adults remains to be activities to benefit from the kind of preparatory established, however, particularly as Maylor's study did processing that we have argued supports the not include a comparison of the use and effectiveness representation of more well-defined (laboratory-based) of conjunction cues between these two age groups. It actions. Indeed, not all naturally occurring intentions is interesting to note in this regard that an attempt has involve action-based responses. Some of the activities been made to enhance older adults' prospective memory generated by participants in the prospective and performance in a laboratory setting by using tasks that retrospective fluency tasks, for example, could be are intended to mimic the richness and structure of daily classified as involving primarily verbal responses life events (e.g., Rendell & Craik, 2000). Age-related (e.g., to have a conversation with someone or to pass declines have still been obtained under these conditions, on a message), while others represent purely thought-however, perhaps because the tasks are not readily able based or cognitive tasks (e.g., "choose holiday to capture or recreate the familiarity and personal destination"). The exact role of preparatory motoric relevance of the individuals' own routines. processing in successful prospective remembering remains to be established, however, as laboratory Intention-superiority effects for naturally studies of the ISE have typically used experimenter-occurring and laboratory activities initiated retrieval, which removes the need for participants to remember to carry out the actions for The current findings reveal a clear age-associated themselves when a designated retrieval context impairment in the ability to access naturally occurring arrives. intentions in a speeded fluency task undertaken during the retention interval between intention formation and Conclusion completion. This is in contrast to the findings of Freeman and Ellis (in press-b), which demonstrated an equivalent In summary, this study revealed a clear age-related de-advantage for to-be-enacted laboratory-based actions cline in the ability to access intention representations over actions not intended for enactment in young and prior to completion, with more intended activities failing healthy older adults. We have argued elsewhere (e.g., to come to mind in the prospective fluency task for older Freeman & Ellis, in press-a) that there may be similarities adults than for young adults. There was no apparent between the advantage for to-be-enacted laboratory-age difference in the inaccessibility (or inhibition) of based actions and the advantage that is frequently already completed intentions, however, with both age observed for verbally presented action words that have groups demonstrating evidence of an intention-been enacted during encoding (the subject-performed completion effect. Despite reduced intention task effect; Cohen, 1981). More specifically, the accessibility during the retention interval, older adults intention-superiority effect for simple motor actions reported having carried out more of their intended intended for enactment after a short delay might reflect activities during the week than did young adults. the operation of covert motoric or SPT-type encoding Interestingly, this appeared to be the case primarily for or rehearsal operations aimed at preparing these actions intentions for which no specific retrieval aids had been for imminent execution. These could include operations used. One possibility is that older adults may for setting the parameters of the action schema to be compensate for impaired intention accessibility by executed in terms of its duration, direction, and force. relying more on the ongoing sequence of daily routine The absence of an age difference in the accessibility of events to support intention retrieval and execution. This laboratory-based intentions mirrors the finding of is consistent with the observation of an age-related reduced age-related declines in memory for SPTs and increase in the temporal organization of activities pro-suggests that covert motoric processing may be duced in the prospective fluency task. In line with this, undertaken relatively automatically for this type of while there was a correlation between intention acces-material. sibility and intention completion in young adults, sug-The apparent discrepancy between age differences gesting a role for the intention-superiority effect in in the ISE for naturally occurring and experimental prospective memory performance in this population, intentions might therefore reflect a fundamental there was no evidence of this relationship among older difference in the nature of the activities involved in adults." In Prospective Memory: The Delayed Realization of Intentions. Psychology Press, 2003. http://dx.doi.org/10.4324/9780203506752-9.

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"is generally compatible with the teaching of the common and vulgar pride in the power of this world’ Reformed church, and therefore with doctrines (cited Var 1.423). Readers today, who rightly query found in the Book of Common Prayer and the hom-any labelling of Spenser’s characters, may query just ilies, rather than as a system of beliefs. See J.N. Wall how the knight’s pride, if he is proud, is personified 1988:88–127. by Orgoglio. Does he fall through pride? Most cer-Traditional interpretations of Book I have been tainly he falls: one who was on horseback lies upon either moral, varying between extremes of psycho-the ground, first to rest in the shade and then to lie logical and spiritual readings, or historical, varying with Duessa; and although he staggers to his feet, he between particular and general readings. Both were soon falls senseless upon the ground, and finally is sanctioned by the interpretations given the major placed deep underground in the giant’s dungeon. classical poets and sixteenth-century romance writers. The giant himself is not ‘identified’ until after the For example, in 1632 Henry Reynolds praised The knight’s fall, and then he is named Orgoglio, not Faerie Queene as ‘an exact body of the Ethicke doc-Pride. Although he is said to be proud, pride is only trine’ while wishing that Spenser had been ‘a little one detail in a very complex description. In his size, freer of his fiction, and not so close riuetted to his descent, features, weapon, gait, and mode of fight-Morall’ (Sp All 186). In 1642 Henry More praised ing, he is seen as a particular giant rather than as a it as ‘a Poem richly fraught within divine Morality particular kind of pride. To name him such is to as Phansy’, and in 1660 offers a historical reading of select a few words – and not particularly interesting Una’s reception by the satyrs in I vi 11–19, saying ones – such as ‘arrogant’ and ‘presumption’ out of that it ‘does lively set out the condition of Chris-some twenty-six lines or about two hundred words, tianity since the time that the Church of a Garden and to collapse them into pride because pride is one became a Wilderness’ (Sp All 210, 249). Both kinds of the seven deadly sins. To say that the knight falls of readings continue today though the latter often through pride ignores the complex interactions of all tends to be restricted to the sociopolitical. An influ-the words in the episode. While he is guilty of sloth ential view in the earlier twentieth century, expressed and lust before he falls, he is not proud; in fact, he by Kermode 1971:12–32, was that the historical has just escaped from the house of Pride. Quite allegory of Book I treats the history of the true deliberately, Spenser seeks to prevent any such moral church from its beginnings to the Last Judgement identification by attributing the knight’s weakness in its conflict with the Church of Rome. According before Orgoglio to his act of ignorantly drinking the to this reading, the Red Cross Knight’s subjection enfeebling waters issuing from a nymph who, like to Orgoglio in canto vii refers to the popish captivity him, rested in the midst of her quest. of England from Gregory VII to Wyclif (about 300 Although holiness is a distinctively Christian years: the three months of viii 38; but see n); and the virtue, Book I does not treat ‘pilgrim’s progress from six years that the Red Cross Knight must serve the this world to that which is to come’, as does Bunyan, Faerie Queene before he may return to Eden refers but rather the Red Cross Knight’s quest in this world to the six years of Mary Tudor’s reign when England on a pilgrimage from error to salvation; see Prescott was subject to the Church of Rome (see I xii 1989. His slaying the dragon only qualifies him to 18.6–8n). While interest in the ecclesiastical history enter the antepenultimate battle as the defender of of Book I continues, e.g. in Richey 1998:16–35, the Faerie Queene against the pagan king (I xii 18), usually it is directed more specifically to its imme-and only after that has been accomplished may he diate context in the Reformation (King 1990a; and start his climb to the New Jerusalem. As a con-Mallette 1997 who explores how the poem appro-sequence, the whole poem is deeply rooted in the priates and parodies overlapping Reformation texts); human condition: it treats our life in this world, or Reformation doctrines of holiness (Gless 1994); under the aegis of divine grace, more comprehens-or patristic theology (Weatherby 1994); or Reforma-ively than any other poem in English. tion iconoclasm (Gregerson 1995). The moral allegory of Book I, as set down by Ruskin in The Stones of Venice (1853), remains gener- Temperance: Book II." In Spenser: The Faerie Queene. Routledge, 2014. http://dx.doi.org/10.4324/9781315834696-29.

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Conference papers on the topic "Exact sequences. eng"

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Chen, Chun-Fu. "Separation in Flat Indentation of Orthotropic Laminated Beams." In ASME 2001 Engineering Technology Conference on Energy. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/etce2001-17155.

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Abstract Problems of indentation of orthotropic laminated beams due to flat punches arc solved. Exact solution methods for a subsidiary problem are developed first for both the simply-supported and clamped-ended cases. A numerical iteration algorithm is then employed to assess the possible separation and the real contact area and the contact stresses for a given punch width and a beam span. The contact stresses and separation results for the beams of a typical span reveal various contact conditions that depend only upon the punch width but not the magnitude of the applied load. For a symmetric
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