Canary
发表于 2025-4-1 03:36:29
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我不重要
发表于 2025-4-1 07:24:30
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compassion
发表于 2025-4-1 11:33:01
Fourier Series and Integrals,fine a periodic function . on the real line . by setting .(.) = .(.). It does not matter whether we study functions on . or periodic functions on .; generally we shall write functions on .. Everyone knows that in this subject the factor 2. appears constantly. Most of these factors can be avoided if