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  2. Parity (mathematics) - Wikipedia

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

    Any two consecutive integers have opposite parity. A number (i.e., integer) expressed in the decimal numeral system is even or odd according to whether its last digit is even or odd. That is, if the last digit is 1, 3, 5, 7, or 9, then it is odd; otherwise it is even—as the last digit of any even number is 0, 2, 4, 6, or 8.

  3. Anti-diagonal matrix - Wikipedia

    en.wikipedia.org/wiki/Anti-diagonal_matrix

    More precisely, the sign of the elementary product needed to calculate the determinant of an anti-diagonal matrix is related to whether the corresponding triangular number is even or odd. This is because the number of inversions in the permutation for the only nonzero signed elementary product of any n × n anti-diagonal matrix is always equal ...

  4. Increment and decrement operators - Wikipedia

    en.wikipedia.org/wiki/Increment_and_decrement...

    Apple's Swift once supported these operators, but they have been depreciated since version 2.2 [13] and removed as of version 3.0. [14] [15] Pascal, Delphi, Modula-2, and Oberon uses functions (inc(x) and dec(x)) instead of operators. Tcl uses the incr command. Notably Python and Rust do not support these operators.

  5. Talk:Negative number - Wikipedia

    en.wikipedia.org/wiki/Talk:Negative_number

    It is absurd to say that the number that is negative is the "opposite of a number". The two numbers are opposites of each other, just as a left hand and a right hand are opposites of each other. To say that a left hand is the opposite of a hand would be absurd. Rick Norwood 10:31, 12 September 2023 (UTC)

  6. Relational operator - Wikipedia

    en.wikipedia.org/wiki/Relational_operator

    A strict equality operator is also often available in those languages, returning true only for values with identical or equivalent types (in PHP, 4 === "4" is false although 4 == "4" is true). [ 3 ] [ 4 ] For languages where the number 0 may be interpreted as false , this operator may simplify things such as checking for zero (as x == 0 would ...

  7. Talk:Bell number - Wikipedia

    en.wikipedia.org/wiki/Talk:Bell_number

    To me, a table breaks the flow of the text in a way that a list does not. I don't have strong feelings about writing "B 0 =1, B 1 = 1, B 2 =2, B 3 =5, B 4 =15". --JBL 18:24, 8 January 2020 (UTC) I'm not sure 10 is the right number but the current listing is definitely too long.

  8. Regression toward the mean - Wikipedia

    en.wikipedia.org/wiki/Regression_toward_the_mean

    Each widget has two numbers, X 1 and X 2 (say, its left span (X 1) and right span (X 2)). Suppose that the probability distributions of X 1 and X 2 in the population are identical, and that the means of X 1 and X 2 are both μ. We now take a random widget from the population, and denote its X 1 value by c. (c may be greater than, equal to, or ...

  9. Proof by contradiction - Wikipedia

    en.wikipedia.org/wiki/Proof_by_contradiction

    The classic proof that the square root of 2 is irrational is a refutation by contradiction. [11] Indeed, we set out to prove the negation ¬ ∃ a, b ∈ . a/b = √ 2 by assuming that there exist natural numbers a and b whose ratio is the square root of two, and derive a contradiction.