On a theorem of W. Meyer-König and H. Tietz by İBrahım Çanak, Mehmet Dık, Fılız Dık

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An Extension Theorem for a Sequence of Krein Space Contractions by Gerald Wanjala

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Analytic Erdös-Turán conjectures and Erdös-Fuchs theorem by L. Haddad, C. Helou, J. Pihko

“…The sequences of such coefficients have a lot of similarity with sequences of natural numbers considered in additive number theory. It is this analogy that we pursue, thus establishing many properties and giving equivalent statements to the well-known Erdös-Turán conjectures in terms of supported series and extending to them a version of Erdös-Fuchs theorem.…”
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Coincidence and fixed point theorems in metric and Banach spaces by Zeqing Liu, Jeong Sheok Ume, Mohammad S. Khan

“…We prove some coincidence and fixed point theorems for generalized (ϕ,f)-contractive type and f-nonexpansive type multivalued and singlevalued mappings in metric and Banach spaces, respectively. …”
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Pick’s Theorem in Two-Dimensional Subspace of R3 by Lin Si

“…For any two-dimensional simple lattice polygon P, we establish the following analogy version of Pick’s Theorem, kIP+1/2BP-1, where BP is the number of lattice points on the boundary of P in Z3, IP is the number of lattice points in the interior of P in Z3, and k is a constant only related to the two-dimensional subspace including P.…”
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A discrete universality theorem for the Matsumoto zeta-function by Roma Kačinskaitė

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From the scientific method to the clinical method: theoretical considerations by Roberto Hernández Hernández

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THEORETICAL AND METHODICAL ASPECTS OF THE ANALYSIS OF THE WORLD FOOD MARKET by V. Mintusov

“…The article is devoted to theoretical aspects of the analysis of the world food market. …”
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Holderian functional central limit theorem for linear processes by Mindaugas Juodis

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Structure Theorem for Functionals in the Space 𝔖′𝜔1,𝜔2 by Hamed M. Obiedat, Wasfi A. Shatanawi, Mohd M. Yasein

“…For functionals in the dual space 𝔖𝜔1,𝜔2, we prove a structure theorem by using the classical Riesz representation thoerem.…”
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ECONOMY AS A PHENOMENON OF CULTURE: THEORETICAL AND METHODOLOGICAL ANALYSIS by S. N. Ivaskovsky

Subjects: “…mathematization of economic theory…”
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On the expansion theorem described by H(A,B) spaces by A. A. El-Sabbagh

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Theorising unconventional climate advocates and their relationship to the environmental movement by R. M. Colvin, Robyn E. Gulliver, Xiongzhi Wang, Ajay Adhikari, Sarah J. Boddington, Kelly S. Fielding, Winnifred R. Louis

“…However, there remain important holdout constituencies that theory and evidence suggest are less likely to be persuaded by environmentalists, especially constituencies associated with resources and economic production, rural and regional areas, masculine norms, and conservative belief systems and politics. …”
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Expansive Fixed Point Theorems for tri-simulation functions by Priya Shahi, Laxmi Rathour, Vishnu Narayan Mishra

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THE MECHANISM OF CURRENCY REGULATION IN MODERN CONDITIONS: THEORETICAL ASPECT by K. G. Bunevich, T. A. Gorbacheva

“…The purpose of this article is to summarize existing theoretical approaches to the problem of formation and regulation of the exchange rate based on the study of the evolution of relevant theories and concepts, as well as the definition of their scope of application and the conditions of validity. …”
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The theoretical cognition and research paradigm of land system science by LONG Hualou, CHEN Kunqiu, ZHENG Yuhan, ZHANG Yingnan

Subjects: “…land system science|development process|theoretical and technological system|research paradigm|land use transition…”
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A single source theorem for primitive points on curves by Maleeha Khawaja, Samir Siksek

“…We prove the following ‘single source’ theorem for primitive points. Suppose $g>(n-1)^2$ if $n \ge 3$ and $g \ge 3$ if $n=2$ . …”
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Coincidence theorems for families of multimaps and their applications to equilibrium problems by Lai-Jiu Lin, Hsin I Chen

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THEORETICAL METHODS FOR INVESTIGATING PROTEIN THERMOSTABILITY AND THEIR APPLICATIONS IN BIOLOGY by N. A. Alemasov, E. S. Fomin

“…Classification of existent theoretical approaches for investigating protein thermal stability is performed. …”
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Coupled Fixed Point Theorems under Weak Contractions by Y. J. Cho, Z. Kadelburg, R. Saadati, W. Shatanawi

“…Appl. 61(2011), 1254–1260] studied common fixed point theorems on cone metric spaces by using the concept of c-distance. …”
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