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Acta Mathematica Sinica (English series) is a peer-reviewed mathematics journal published quarterly by Springer.Founded in 1936 and split into a Chinese series and an English series in 1985, the journal publishes articles on all areas of mathematics, and allows submissions from researchers of all nationalities.
Acta Mathematicae Applicatae Sinica (English series) is a peer-reviewed mathematics journal published quarterly by Springer. Established in 1984 by the Chinese Mathematical Society, the journal publishes articles on applied mathematics. According to the Journal Citation Reports, the journal had a 2020 impact factor of 1.102. [1]
Ptolemy's theorem states that the sum of the products of the lengths of opposite sides is equal to the product of the lengths of the diagonals. When those side-lengths are expressed in terms of the sin and cos values shown in the figure above, this yields the angle sum trigonometric identity for sine: sin(α + β) = sin α cos β + cos α sin β.
Acta Mathematica is a peer-reviewed open-access scientific journal covering research in all fields of mathematics. According to Cédric Villani , this journal is "considered by many to be the most prestigious of all mathematical research journals". [ 1 ]
For example, the sine of angle θ is defined as being the length of the opposite side divided by the length of the hypotenuse. The six trigonometric functions are defined for every real number , except, for some of them, for angles that differ from 0 by a multiple of the right angle (90°).
In mathematics, the values of the trigonometric functions can be expressed approximately, as in (/), or exactly, as in (/) = /. While trigonometric tables contain many approximate values, the exact values for certain angles can be expressed by a combination of arithmetic operations and square roots .
His first paper, Multiple values of meromorphic functions and of their combinations, was completed in 1962 three months after he enrolled in the graduate program at the Institute of Mathematics. It was published in 1964 in Acta Math. Sinica.
Sun Song (Chinese: 孙崧; pinyin: Sūn Sōng, born in 1987) is a Chinese mathematician whose research concerns geometry and topology.A Sloan Research Fellow, he was a professor in the Department of Mathematics of the University of California, Berkeley from 2018 until 2023.