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  2. Knuth's up-arrow notation - Wikipedia

    en.wikipedia.org/wiki/Knuth's_up-arrow_notation

    The sequence starts with a unary operation (the successor function with n = 0), and continues with the binary operations of addition (n = 1), multiplication (n = 2), exponentiation (n = 3), tetration (n = 4), pentation (n = 5), etc. Various notations have been used to represent hyperoperations.

  3. Glossary of mathematical symbols - Wikipedia

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

    2. Denotes the additive inverse and is read as minus, the negative of, or the opposite of; for example, –2. 3. Also used in place of \ for denoting the set-theoretic complement; see \ in § Set theory. × (multiplication sign) 1. In elementary arithmetic, denotes multiplication, and is read as times; for example, 3 × 2. 2.

  4. Mathematical object - Wikipedia

    en.wikipedia.org/wiki/Mathematical_object

    In metaphysics, objects are often considered entities that possess properties and can stand in various relations to one another. [3] Philosophers debate whether mathematical objects have an independent existence outside of human thought ( realism ), or if their existence is dependent on mental constructs or language ( idealism and nominalism ).

  5. Mnemonic major system - Wikipedia

    en.wikipedia.org/wiki/Mnemonic_major_system

    3 /m/ m: Lower case m has three vertical strokes. Both upper case M and lower case m each have three points on the baseline and look like the numeral 3 on its side. 4 /r/ r, l (as sounded in colonel) Four ends with r (and /r/ in rhotic accents). 5 /l/ l: L is the Roman numeral for 50. Among the five digits of one's left hand, the thumb and ...

  6. Glossary of mathematical jargon - Wikipedia

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

    For example, squares (resp. triangles) have 4 sides (resp. 3 sides); or compact (resp. Lindelöf) spaces are ones where every open cover has a finite (resp. countable) open subcover. sharp Often, a mathematical theorem will establish constraints on the behavior of some object ; for example, a function will be shown to have an upper or lower bound .

  7. Missing square puzzle - Wikipedia

    en.wikipedia.org/wiki/Missing_square_puzzle

    The apparent triangles formed from the figures are 13 units wide and 5 units tall, so it appears that the area should be S = ⁠ 13×5 / 2 ⁠ = 32.5 units. However, the blue triangle has a ratio of 5:2 (=2.5), while the red triangle has the ratio 8:3 (≈2.667), so the apparent combined hypotenuse in each figure is actually bent.

  8. Babylonian mathematics - Wikipedia

    en.wikipedia.org/wiki/Babylonian_mathematics

    The diagonal displays an approximation of the square root of 2 in four sexagesimal figures, 1 24 51 10, which is good to about six decimal digits. 1 + 24/60 + 51/60 2 + 10/60 3 = 1.41421296... The tablet also gives an example where one side of the square is 30, and the resulting diagonal is 42 25 35 or 42.4263888...

  9. Portal:Mathematics - Wikipedia

    en.wikipedia.org/wiki/Portal:Mathematics

    In this graph, an even number of vertices (the four vertices numbered 2, 4, 5, and 6) have odd degrees. The sum of degrees of all six vertices is 2 + 3 + 2 + 3 + 3 + 1 = 14 , twice the number of edges.