substitution
in general - see
this note
substitution in Fourier series - see
Series - Theory - Series of functions - Properties of Fourier series
substitution in integrals - see
Integrals - Theory - Methods of integration - Substitution
and
Integrals - Methods Survey - Methods of integration - Substitution
Euler - see
Integrals - Methods Survey - Methods of integration - Roots of quadratics
trigonometric - see
Integrals - Methods Survey - Methods of integration - Trig integrals
and
Integrals - Methods Survey - Methods of integration - Roots of quadratics
universal - see
Integrals - Methods Survey - Methods of integration - Trig integrals
substitution in limits - see
Functions - Methods Survey - Limit - Substitution
substitution in sequences - see
Sequences - Methods Survey - Limit - Substitution
substitution in Taylor series - see
Series - Theory - Series of functions - Taylor series