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  2. List of logic symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_logic_symbols

    Corner quotes, also called “Quine quotes”; for quasi-quotation, i.e. quoting specific context of unspecified (“variable”) expressions; [4] also used for denoting Gödel number; [5] for example “āŒœGāŒ” denotes the Gödel number of G. (Typographical note: although the quotes appears as a “pair” in unicode (231C and 231D), they ...

  3. Quasi-quotation - Wikipedia

    en.wikipedia.org/wiki/Quasi-quotation

    In other words, our second rule says "If some sequence of symbols φ (for example, the sequence of 3 symbols φ = '~~p') is a well-formed formula (wff) of L, then the sequence of 2 symbols '~φ' is a well-formed formula (wff) of L". Rule 2 needs to be changed so that the second occurrence of 'φ' (in quotes) be not taken literally.

  4. Quotation mark - Wikipedia

    en.wikipedia.org/wiki/Quotation_mark

    The usage of curved quotation marks (ex. “quote” and ‘quote’) is growing in Portugal, [81] [better source needed] probably due to the omnipresence of the English language and to the corresponding difficulty (or even inability) to enter angular quotation marks on some machines (mobile phones, cash registers, calculators, etc.).

  5. Quantum logic gate - Wikipedia

    en.wikipedia.org/wiki/Quantum_logic_gate

    The Pauli X, Y and Z equate, respectively, to a rotation around the x, y and z axes of the Bloch sphere by radians. [ b ] The Pauli- X gate is the quantum equivalent of the NOT gate for classical computers with respect to the standard basis | 0 {\displaystyle |0\rangle } , | 1 {\displaystyle |1\rangle } , which distinguishes the z axis on the ...

  6. Keyboard layout - Wikipedia

    en.wikipedia.org/wiki/Keyboard_layout

    A and Q are swapped, Z and W are swapped, M is moved to the right of L, (taking place of the :/; or colon/semicolon key on a US keyboard), The digits 0 to 9 are on the same keys, but to be typed the shift key must be pressed. The unshifted positions are used for accented characters, Caps lock is replaced by Shift lock, thus affecting non-letter ...

  7. Mathematical operators and symbols in Unicode - Wikipedia

    en.wikipedia.org/wiki/Mathematical_operators_and...

    šŸš šŸ› šŸœ šŸ šŸž šŸŸ U+1D7Ex šŸ  šŸ” šŸ¢ šŸ£ šŸ¤ šŸ„ šŸ¦ šŸ§ šŸØ šŸ© šŸŖ šŸ« šŸ¬ šŸ­ šŸ® šŸÆ U+1D7Fx šŸ° šŸ± šŸ² šŸ³ šŸ“ šŸµ šŸ¶ šŸ· šŸø šŸ¹ šŸŗ šŸ» šŸ¼ šŸ½ šŸ¾ šŸæ Notes 1. ^ As of Unicode version 16.0 2. ^ Grey areas indicate non-assigned code points

  8. Substitution (logic) - Wikipedia

    en.wikipedia.org/wiki/Substitution_(logic)

    An example for a renaming substitution is { x ā†¦ x 1, x 1 ā†¦ y, y ā†¦ y 2, y 2 ā†¦ x}, it has the inverse { x ā†¦ y 2, y 2 ā†¦ y, y ā†¦ x 1, x 1 ā†¦ x}. The flat substitution { x ā†¦ z, y ā†¦ z} cannot have an inverse, since e.g. (x+y) { x ā†¦ z, y ā†¦ z} = z+z, and the latter term cannot be transformed back to x+y, as the information about ...

  9. Guillemet - Wikipedia

    en.wikipedia.org/wiki/Guillemet

    Hungarian (only used „inside a section »as a secondary quote« marked by the usual quotes” like this) Polish (used to indicate a quote inside a quote as defined by dictionaries; more common usage in practice. See also: Polish orthography)