This module provides numerical integration by double-exponential (DE) formula.

A struct for performing numerical integration by double-exponential (DE) formula. It is also known as "Tanh-sinh quadrature". In DE formula, the integration (1) is converted to (2). (1) int_{xa}^{xb} f(x) dx (2) int_{ta}^{tb} f(g(t)) g'(t) dt

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This module provides numerical integration by double-exponential (DE) formula.