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16 Cards in this Set
- Front
- Back
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X |
William Oughtred (also knwon St. Andrew's Cross) 1618 |
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• |
leibniz 1698 |
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÷ (obelus) |
Johann Rahn 1659 |
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Wentworth |
1888 |
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= |
Robert Recorde 1557 |
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<> strict inequalities |
Thomas Harriot 1631 |
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≤≥ |
Prierre Bouguer 1734 John Wallis 1670 |
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√ radical Symbol |
Christoff Rudolff 1525 1637 Rene Descartes added vinculum |
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n√ placement of the index |
Albert Girard 1629 |
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n! notation |
Christian Kramp 1808 |
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!n |
Albert Eagle 1958 |
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+- oun("or") |
Albert Girard 1626 sign in its modern form was used by William Oughtred 1631 |
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x, y, z represent the unknown |
Rene Descartes 1637 |
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π Perimeter |
William Jone 1706 |
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e Euler Constant |
2.71829 in 1727 |
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∞ infinity |
John Wallis 1655 |
