Law-of-definite-composition
noun
1.
Chemistry. the statement that in a pure compound the elements are always combined in fixed proportions by weight.
2.
Logic. the law that either a proposition or its denial must be true.
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- Law-of-exponents
noun, Mathematics. 1. the theorem stating the elementary properties of exponents, as the property that the product of the same bases, each raised to an exponent, is equal to the base raised to the sum of the exponents: xa ⋅ xb = xa + b .