The inequality in living standards led to a civil war as the have nots rebelled.
b) A statement that of two quantities one is specifically less than (or greater than) another. Symbol: < or ≤ or > or ≥, as appropriate.
The inequality x is less than y, together with that y<z, allows us to deduce the inequality x<z. <! A statement that of two quantities one is specifically less than (or greater than, or not less than, or not greater than) another. Thats just the distinction between inequality and strict inequality that should be discussed at strict inequality
Wikipedia foundation.