Able to be exchanged for each other; capable of being substituted for one another.
From co- 'together' + exchangeable (from exchange: Latin ex- 'out' + cambiare 'to barter'). A rare term combining exchange with the prefix indicating mutual substitution.
In mathematics and logic, coexchangeable variables are ones that can be swapped without changing the truth of an equation—a concept that seems simple but has deep implications in probability theory.
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