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2. Ordinal indicator - Wikipedia

   en.wikipedia.org/wiki/Ordinal_indicator

   In English orthography, this corresponds to the suffixes ‑st, ‑nd, ‑rd, ‑th in written ordinals (represented either on the line 1st, 2nd, 3rd, 4th or as superscript 1 st, 2 nd, 3 rd, 4 th). Also commonly encountered in Romance languages are the superscript or superior (and often underlined) masculine ordinal indicator , º , and ...

3. Ordinal numeral - Wikipedia

   en.wikipedia.org/wiki/Ordinal_numeral

   Ordinal numbers may be written in English with numerals and letter suffixes: 1st, 2nd or 2d, 3rd or 3d, 4th, 11th, 21st, 101st, 477th, etc., with the suffix acting as an ordinal indicator. Written dates often omit the suffix, although it is nevertheless pronounced. For example: 5 November 1605 (pronounced "the fifth of November ...

4. List of typographical symbols and punctuation marks

   en.wikipedia.org/wiki/List_of_typographical...

   The second is a link to the article that details that symbol, using its Unicode standard name or common alias. (Holding the mouse pointer on the hyperlink will pop up a summary of the symbol's function.); The third gives symbols listed elsewhere in the table that are similar to it in meaning or appearance, or that may be confused with it;

5. Subscript and superscript - Wikipedia

   en.wikipedia.org/wiki/Subscript_and_superscript

   Ordinal indicators are sometimes written as superscripts (1 st, 2 nd, 3 rd, 4 th, rather than 1st, 2nd, 3rd, 4th), although many English-language style guides recommend against this use. [4] Romance languages use a similar convention, such as 1 er or 2 e in French, or 4ª and 4º in Galician and Italian, or 4.ª and 4.º in Portuguese and Spanish.

6. Ordinal number - Wikipedia

   en.wikipedia.org/wiki/Ordinal_number

   Cantor proved that the cardinality of the second number class is the first uncountable cardinality. [12] Cantor's second theorem becomes: If P ′ is countable, then there is a countable ordinal α such that P (α) = ∅. Its proof uses proof by contradiction. Let P ′ be countable, and assume there is no such α. This assumption produces two ...

7. Glossary of mathematical symbols - Wikipedia

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

   A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula. As formulas are entirely constituted with symbols of various types, many symbols are needed for ...

8. Quadrant (plane geometry) - Wikipedia

   en.wikipedia.org/wiki/Quadrant_(plane_geometry)

   Signs of trigonometric functions in each quadrant. In the above graphic, the words in quotation marks are a mnemonic for remembering which three trigonometric functions (sine, cosine and tangent) are positive in each quadrant. The expression reads "All Science Teachers Crazy" and proceeding counterclockwise from the upper right quadrant, we see ...

9. 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