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Commit 2021-12-09 21:51 61dd3432

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feat(probability_theory/martingale): define martingales (#10625)

Estimated changes

Modified src/measure_theory/function/conditional_expectation.lean

added theorem measure_theory.condexp_condexp_of_le

Modified src/measure_theory/measure/measure_space.lean

added theorem measure_theory.trim_trim

Created src/probability_theory/martingale.lean

added theorem measure_theory.martingale.adapted

added theorem measure_theory.martingale.add

added theorem measure_theory.martingale.condexp_ae_eq

added theorem measure_theory.martingale.integrable

added theorem measure_theory.martingale.measurable

added theorem measure_theory.martingale.neg

added theorem measure_theory.martingale.smul

added theorem measure_theory.martingale.sub

added def measure_theory.martingale

added theorem measure_theory.martingale_condexp

added theorem measure_theory.martingale_zero