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  2. 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.

  3. List of logic symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_logic_symbols

    The following table lists many common symbols, together with their name, how they should be read out loud, and the related field of mathematics. Additionally, the subsequent columns contains an informal explanation, a short example, the Unicode location, the name for use in HTML documents, [1] and the LaTeX symbol.

  4. List of quantum logic gates - Wikipedia

    en.wikipedia.org/wiki/List_of_quantum_logic_gates

    The rotation operator gates (), and () are the analog rotation matrices in three Cartesian axes of SO(3), [c] along the x, y or z-axes of the Bloch sphere projection. As Pauli matrices are related to the generator of rotations, these rotation operators can be written as matrix exponentials with Pauli matrices in the argument.

  5. 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.).

  6. Substitution (logic) - Wikipedia

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

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

  7. Mathematical operators and symbols in Unicode - Wikipedia

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

    𝟙 𝟚 𝟛 𝟜 𝟝 𝟞 𝟟 U+1D7Ex 𝟠 𝟡 𝟢 𝟣 𝟤 𝟥 𝟦 𝟧 𝟨 𝟩 𝟪 𝟫 𝟬 𝟭 𝟮 𝟯 U+1D7Fx 𝟰 𝟱 𝟲 𝟳 𝟴 𝟵 𝟶 𝟷 𝟸 𝟹 𝟺 𝟻 𝟼 𝟽 𝟾 𝟿 Notes 1. ^ As of Unicode version 16.0 2. ^ Grey areas indicate non-assigned code points

  8. Why the letter Z has become Russia's pro-war symbol during ...

    www.aol.com/news/why-letter-z-become-russia...

    Russia’s defense ministry has not explicitly commented on the use of the letter in its current context, but did post on Instagram last week that the pro-war symbol stems from the Russian phrase ...

  9. Quotation marks in English - Wikipedia

    en.wikipedia.org/wiki/Quotation_marks_in_English

    In English writing, quotation marks or inverted commas, also known informally as quotes, talking marks, [1] [2] speech marks, [3] quote marks, quotemarks or speechmarks, are punctuation marks placed on either side of a word or phrase in order to identify it as a quotation, direct speech or a literal title or name.