I know that x > y1 is an inequality but I am in doubt over whether y1 < x < y2 is an inequality or inequalities. Which is right? I think that it may be a math question, but I will be thankful if anyone answers it.
Answer
As it says in this College Algebra book...
An inequality of the form
a < x < b
is sometimes referred to as a simultaneous inequality.
We're obviously dealing with domain-specific terminology, but I personally (not a mathematician) wouldn't call a = b = c "equalities" - since it's a single expression, I'd say it's an "equality". But we're not exactly talking standard English here, whether it's singular or plural (most people would probably just say it's an "equation" and leave it at that).
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