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  2. Less-than sign - Wikipedia

    en.wikipedia.org/wiki/Less-than_sign

    The less-than sign with the equals sign, <=, may be used for an approximation of the less-than-or-equal-to sign, ≤. ASCII does not have a less-than-or-equal-to sign, but Unicode defines it at code point U+2264. In BASIC, Lisp-family languages, and C-family languages (including Java and C++), operator <= means "less than or equal to".

  3. Table of mathematical symbols by introduction date - Wikipedia

    en.wikipedia.org/wiki/Table_of_mathematical...

    unstrict inequality signs (less-than or equals to sign and greater-than or equals to sign) 1670 (with the horizontal bar over the inequality sign, rather than below it) John Wallis: 1734 (with double horizontal bar below the inequality sign) Pierre Bouguer

  4. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    less-than sign) 1. Strict inequality between two numbers; means and is read as "less than". 2. Commonly used for denoting any strict order. 3. Between two groups, may mean that the first one is a proper subgroup of the second one. > (greater-than sign) 1.

  5. Mathematical operators and symbols in Unicode - Wikipedia

    en.wikipedia.org/wiki/Mathematical_operators_and...

    fullwidth plus sign u+ff1c < fullwidth less-than sign u+ff1d = fullwidth equals sign u+ff1e > fullwidth greater-than sign u+ff3c \ fullwidth reverse solidus u+ff3e ^ fullwidth circumflex accent u+ff5c | fullwidth vertical line u+ff5e ~ fullwidth tilde u+ffe2 ¬ fullwidth not sign u+ffe9 ← halfwidth leftwards arrow u+ffea ...

  6. Plus and minus signs - Wikipedia

    en.wikipedia.org/wiki/Plus_and_minus_signs

    The plus sign (+) and the minus sign (−) are mathematical symbols used to denote positive and negative functions, respectively. In addition, + represents the operation of addition, which results in a sum, while − represents subtraction, resulting in a difference. [1] Their use has been extended to many other meanings, more or less analogous.

  7. Little Professor - Wikipedia

    en.wikipedia.org/wiki/Little_Professor

    The Little Professor was first released by Texas Instruments on June 13, 1976. [5] As the first electronic educational toy, [6] [7] the Little Professor is a common item on calculator collectors' lists. [8] In 1976, the Little Professor cost less than $20. More than 1 million units sold in 1977. [9]

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  9. Significant figures - Wikipedia

    en.wikipedia.org/wiki/Significant_figures

    If the n + 1 digit is greater than 5 or is 5 followed by other non-zero digits, add 1 to the n digit. For example, if we want to round 1.2459 to 3 significant figures, then this step results in 1.25. For example, if we want to round 1.2459 to 3 significant figures, then this step results in 1.25.