1. Mathematics
2. Algebra
3. Combinatorics
4. 18650

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|mA| = |detm| |A| For every Lebesgue set A belogning to R^n and every invertible n x n matrix m. Use this to prove the change of variable theorem.

(*) The integral (mb) of f(y)dy = the integral (b) of f(mx)|detm| dx for everyy Lebesgue measurable function f = R^n --> R which is LEbesgue integrable on a Lebesgue set B the union of R^n.

Hint: First establish (*) for simple functions f = SUM (C_k)(X_Ak)

with |A_k| < infinity for all k. Recall that the integral (mb) of f(y) dy means the integral (R^n) of fX_mb du_m where u_n is Lebesgue measure on R^n.