Writing inequalities
a<b reads "a is less than b"; a>b — "a is greater than b".
The symbols "≤" and "≥" allow equality: a≤b means either a<b or a=b; similarly for "≥".
Any inequality can be flipped: a<b⇔b>a (strictness is preserved the same way for ≤ and ≥). For expressions with variables the meaning is the same, but the solution set is a description of many x — that comes in later lessons of this section.
Strict: only > or <, no equality
Flipping the inequality is the same statement with the letters in the other order
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