Less than symbol (<) indicates left value is smaller than right. Used in comparisons with greater than (>) and equal to (=) symbols. Binary symbol requiring two operands
Less than or equal to indicates values that are less than or equal to a number. The symbol "≤" represents less than or equal to. Numbers less than (<) and greater than (>) are represented by open circles. Numbers less than or equal to (≤) and greater than or equal to (≥) are represented by closed circles
An interval is all the numbers between two given values. Intervals can include or exclude numbers at each end. Real numbers are included in intervals
Equal sign (=) indicates values are equal. Not equal to (≠) shows values are not equal. Less than (<) indicates values are smaller than. Greater than (>) indicates values are larger than
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Named after Jacob Bernoulli, first published in 1689. Originally attributed to Sluse in 1668's Mesolabum. Approximates exponentiations of real numbers