A quantity is said to be less than if is smaller than , written . If is less than or equal to , the relationship is written . In Mathematica, this is denoted Less[a, b], or a < b.

If is much less than , this is written . Statements involving greater than and less than symbols are called inequalities.

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Weisstein, Eric W. "Less." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/Less.html