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2. Subtraction - Wikipedia

   en.wikipedia.org/wiki/Subtraction

   In what is known in the United States as traditional mathematics, a specific process is taught to students at the end of the 1st year (or during the 2nd year) for use with multi-digit whole numbers, and is extended in either the fourth or fifth grade to include decimal representations of fractional numbers.

3. Operation (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Operation_(mathematics)

   For example, in the real numbers, the squaring operation only produces non-negative numbers; the codomain is the set of real numbers, but the range is the non-negative numbers. Operations can involve dissimilar objects: a vector can be multiplied by a scalar to form another vector (an operation known as scalar multiplication ), [ 13 ] and the ...

4. Parity (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Parity_(mathematics)

   The division of two whole numbers does not necessarily result in a whole number. For example, 1 divided by 4 equals 1/4, which is neither even nor odd, since the concepts of even and odd apply only to integers. But when the quotient is an integer, it will be even if and only if the dividend has more factors of two than the divisor. [6]

5. Mathematics - Wikipedia

   en.wikipedia.org/wiki/Mathematics

   Mathematics is a field of study that discovers and organizes methods, theories and theorems that are developed and proved for the needs of empirical sciences and mathematics itself.

6. Subtract a square - Wikipedia

   en.wikipedia.org/wiki/Subtract_a_square

   the number N+1 is 'cold' if only 'hot' numbers can be reached by subtracting a positive square; the number N+1 is 'hot' if at least one 'cold' number can be reached by subtracting a positive square; Using this algorithm, a list of cold numbers is easily derived: 0, 2, 5, 7, 10, 12, 15, 17, 20, 22, 34, 39, 44, … (sequence A030193 in the OEIS)

7. 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 ...