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Is there a term used to describe both an equation and inequality? The closest thing I can think of is "relation".

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I'd use "relation" too. – J. M. Aug 20 '12 at 18:15
How about inequation? :-). – copper.hat Aug 20 '12 at 18:21
It depends on context, but to the extent these are not tautologies, they are often constraints. – Henry Aug 20 '12 at 18:24
For many authors "inequalities" include "equalities", just like noncommutative rings include commutative rings (here 'non' means 'not necessarily'). – Bill Dubuque Aug 20 '12 at 18:31
Note that an equality is just two inequalities in opposite directions. – Euler....IS_ALIVE Aug 20 '12 at 19:01

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