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Special functions, orthogonal polynomials, harmonic analysis, ordinary differential equations (ODE's), differential relations, calculus of variations, approximations, expansions, asymptotics.

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Why are simple functions defined for positive coefficients (in measure theory) [duplicate]

Possible Duplicate: Why is Lebesgue integration taught using positive and negative parts of functions? Hey, I am currently referring 'probability with martingales'. To develop lesbegue integ …
Adwaitvedant Mathkar's user avatar