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Leonard Euler (1707-1783) gave us a number of symbols. They are listed below.

f(x) | for functional notation |

e | for the base of natural logarithms |

a, b, c | for the sides of triangle ABC |

for the summation sign | |

i | for the imaginary unit, the square root of -1 |

Thomas Harriot (1560-1621), usually considered the founder of the English school of algebraists, was the first to use the signs > and < for "is greater than" and "is less than," respectively.

Gottfried Wilhelm Leibniz (1646-1716) gave us our intersection symbol, , and union symbol, , from set theory.

In 1808 Christian Kramp (1760-1826) of Strassbourg introduced n! for factorial n (or n factorial). The previous symbol was causing printing difficulties.

John Wallis (1616-1703), a mathematician and one of the first to create a system for teaching deaf mutes, introduced our present symbol for infinity .