Bra–ket notation

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

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What Wikipedia says

Bra–ket notation or Dirac notation is a mathematical notation for linear algebra and linear operators on complex vector spaces together with their dual spaces both in the finite- and infinite-dimensional cases. It is specifically designed to ease the types of calculations that frequently arise in quantum mechanics.

Excerpt from the Wikipedia article “Bra–ket notation”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Guilhem Vellut from Paris, France, CC BY 2.0, via Wikimedia Commons.