HAVEN
发表于 2025-3-21 19:34:13
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营养
发表于 2025-3-21 23:20:55
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Vo2-Max
发表于 2025-3-22 04:15:58
A Class of Nonautonomous Differential Equations Reducible to Autonomous Ones by an Exact Method..—This paper is concerned with the reduction of a class of nonautonomous differential equations to another class of autonomous ones by using an exact method based on an appropriate transformation of the independent variable. A condition necessary and sufficient for the reducibility is found and proved.
BRAVE
发表于 2025-3-22 05:47:15
ΕΦΗΡΜΟΣΜΕΝΑ ΜΑΘΗΜΑΤΙΚΑ. — Nonlinear differential equations with several general solutionsNonlinear differential equations constitute today a field of scientific knowledge basic for the investigation of the majority of physical phenomena, technological systems, social problems.
Ondines-curse
发表于 2025-3-22 11:35:33
ΜΑΘΗΜΑΤΙΚΑ. — The general solutions of nonlinear differential equations as functions of their arbitrOne of the major difficulties encountered in the general solutions of nonlinear differential equations, in contrast to the solutions of linear ones, is the manner in which the arbitrary constants enter these solutions. In this paper information is given and results are found in connection with this subject.
难取悦
发表于 2025-3-22 16:07:59
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原谅
发表于 2025-3-22 18:44:26
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苦笑
发表于 2025-3-22 21:31:17
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Truculent
发表于 2025-3-23 01:51:00
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neutral-posture
发表于 2025-3-23 07:35:55
ΜΑΘΗΜΑΤΙΚΑ. — Characteristic Properties of Linear and Nonlinear SystemsIn two previous papers (published in : Practica of Athens Academy, June 1976; and as GE Reports: (a) 76SDRO26, 6/28/76; and b) 76SDRO27, 7/1/76, we examined exact and approximate methods of linearization of nonlinear systems.