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... > Science > Exact science > Mathematics > Algebra (lv) > Polynomials > Approximation theory > Pertubation theory

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... > Science > Exact science > Mathematics > Functions > Approximation theory > Pertubation theory

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... > Science > Natural history > Mathematics > Maxima and minima > Calculus of variations > Functional analysis > Approximation theory > Pertubation theory

... > Science > Exact science > Mathematics > Maxima and minima > Calculus of variations > Functional analysis > Approximation theory > Pertubation theory