↯ - Wikipedia

↯ - Wikipedia: "It is used for indicating a contradiction (the relationship between incompatible propositions) in mathematical logic"



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Set-builder notation - Wikipedia

Set-builder notation - Wikipedia: "Defined sets by properties is also known as set comprehension, set abstraction or as defining a set's intension.
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Why do we call them headphone “jacks”? – mashed radish

Why do we call them headphone “jacks”? – mashed radish:



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What is the difference between a bolt, a screw and a stud? - Quora

What is the difference between a bolt, a screw and a stud? - Quora:

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Morphism - Wikipedia

Morphism - Wikipedia: "Examples[edit]
In the concrete categories studied in universal algebra (groups, rings, modules, etc.), morphisms are usually homomorphisms. Likewise, the notions of automorphism, endomorphism, epimorphism, homeomorphism, isomorphism, and monomorphism all find use in universal algebra.
In the category of topological spaces, morphisms are continuous functions and isomorphisms are called homeomorphisms.
In the category of smooth manifolds, morphisms are smooth functions and isomorphisms are called diffeomorphisms."

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symbols - Typeset an = with an ! above - TeX - LaTeX Stack Exchange

symbols - Typeset an = with an ! above - TeX - LaTeX Stack Exchange: "equals because of data that was given in the problem"

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Hi-hat - Wikipedia

Hi-hat - Wikipedia: "X-hats[edit source]
An X-hat is an adapter to allow a pair of hi-hat cymbals to be mounted in a closed position on a cymbal stand. There is no pedal, the hats are simply kept closed at a constant tension, similar to a cymbal stack."

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For example, Yamaha CHH920.