tomathlib/finset-one-le-prod#54
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Product inequality for CommMonoidWithZero: if all elements are at least 1, then their product is at least 1. Fills a gap in Mathlib which has this for IsOrderedMonoid but not for types with zero like ℝ. Also removes unused Trigonometric.Series import from Basic.lean.
Replace non-standard triple apostrophes with descriptive name
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