User:Boris Tsirelson/sandbox1

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In terms of maps

Theorem 4a. If $(X,\B)$ is a standard Borel space, $(Y,\A)$ a countably separated measurable space, and $f:X\to Y$ a measurable one-to-one map then $f(X)$ is measurable.

Elementary

Absolute value + Additivity + Algebra + Algebra, fundamental theorem of + Algebra of sets + Analytic geometry + Antinomy + Arabic numerals + Arithmetic mean + Arithmetic root + Assertion + Associativity + Axiomatic method + Axonometry

Ball + Bayes formula + Bell inequalities + Benford law + Bernoulli experiment + Bernoulli random walk + Bertrand paradox + Binary tree + Binomial distribution + Bit