In mathematics, change of base can mean any of several things:
- Changing numeral bases, such as converting from base 2 (binary) to base 10 (decimal). This is known as base conversion.
- The logarithmic change-of-base formula, one of the logarithmic identities used frequently in algebra and calculus.
- The method for changing between polynomial and normal bases, and similar transformations, for purposes of coding theory and cryptography.
- Construction of the fiber product of schemes, in algebraic geometry.
See also
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