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# Questions

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### Why is symplectic geometry so important in modern PDE ?

jan 23 at 23:11 David Roberts 11.9k21856

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### what’s the motivation of Weyl calculus ?

feb 28 at 22:18 Sönke Hansen 35113

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### fractional Leibniz formula

sep 17 at 12:01 Shanlin Huang 93629

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### What’s the use of Malgrange preparation theorem?

oct 8 at 20:44 Bazin 3,07338

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### when a pseudo-differential operators to be compact?

may 17 12 at 14:26 Shanlin Huang 93629

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### (sharp)Garding’s inequality and inequality with lower bounds

may 7 12 at 12:29 Bazin 3,07338

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### Wave equation v.s.Schrödinger equation

aug 3 at 12:56 PaPiro 1,3561926

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### Higher order fractional laplacian

apr 23 12 at 12:58 Manuel Ortigueira 111

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### The fourier transform of homogeneous distribution and related topics

apr 25 12 at 19:58 Bazin 3,07338

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