puzzle 发表于 2025-3-23 13:18:42
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Direct Methods in the Calculus of Variations,tted functions, then physical or geometric insights into the problem might lead to the conclusion that it is indeed the desired extremal. In addition, the second variation provides necessary and also sufficient conditions on extremals.Graves’-disease 发表于 2025-3-23 19:24:07
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0939-2475 f-study.. .The book will be particularly useful for beginning graduate students from the physical,engineering, and mathematical sciences with a rigorous theoretical background. .978-3-319-89038-8978-3-319-71123-2Series ISSN 0939-2475 Series E-ISSN 2196-9949爆炸 发表于 2025-3-25 00:59:57
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