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  2. Mathematical operators and symbols in Unicode - Wikipedia

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

    The Arrows block (U+2190–U+21FF) contains line, curve, and semicircle arrows and arrow-like operators. The math subset of this block is U+2190–U+21A7, U+21A9–U+21AE, U+21B0–U+21B1, U+21B6–U+21B7, U+21BC–U+21DB, U+21DD, U+21E4–U+21E5, U+21F4–U+21FF.

  3. Old-fashioned doughnut - Wikipedia

    en.wikipedia.org/wiki/Old-fashioned_doughnut

    Old-fashioned doughnuts – cinnamon sugar (left), chocolate glazed (centre top) and maple glazed (right). Shape shown is typical of commercially available buttermilk donuts. The old-fashioned doughnut is a term used for a variety of cake doughnut prepared in the shape of a ring with a cracked surface and tapered edges around it. [1]

  4. Toric code - Wikipedia

    en.wikipedia.org/wiki/Toric_code

    Since the stabilizer operators of the toric code are quasilocal, acting only on spins located near each other on a two-dimensional lattice, it is not unrealistic to define the following Hamiltonian, H T C = − J ∑ v A v − J ∑ p B p , J > 0. {\displaystyle H_{\rm {TC}}=-J\sum _{v}A_{v}-J\sum _{p}B_{p},\,\,\,J>0.}

  5. Have Doughnut - Wikipedia

    en.wikipedia.org/wiki/Have_Doughnut

    Have Doughnut. Have Doughnut flying in 1968. NASIC document describing the program. Have Doughnut was the name of a Defense Intelligence Agency project whose purpose was to evaluate and exploit a MiG-21 "Fishbed-E" that the United States Air Force acquired in 1967 from Israel. Israel acquired the aircraft as the result of its Operation Diamond ...

  6. Z code - Wikipedia

    en.wikipedia.org/wiki/Z_code

    There are at least three sets of Z codes. 1. One set of codes was originally developed by Cable & Wireless Ltd. (the Cable & Wireless Service Z code) for commercial communications in the early days of wire and radio communications. The old C&W Z codes are not widely used today. 2. APCO [clarification needed] also developed a system of Z codes. [1]

  7. APL syntax and symbols - Wikipedia

    en.wikipedia.org/wiki/APL_syntax_and_symbols

    APL is going to execute from right-to-left. Step 1 {of topmost APL code entered at left}) 4-5 = -1. Step 2) 3 times -1 = -3. Step 3) Take the floor or lower of 2 and -3 = -3. Step 4) Divide 1 by -3 = -0.3333333333 = final result. An operator may have function or data operands and evaluate to a dyadic or monadic function.

  8. d'Alembert operator - Wikipedia

    en.wikipedia.org/wiki/D'Alembert_operator

    d'Alembert operator. In special relativity, electromagnetism and wave theory, the d'Alembert operator (denoted by a box: ), also called the d'Alembertian, wave operator, box operator or sometimes quabla operator [1] ( cf. nabla symbol) is the Laplace operator of Minkowski space. The operator is named after French mathematician and physicist ...

  9. Neural operators - Wikipedia

    en.wikipedia.org/wiki/Neural_operators

    Neural operators are a class of deep learning architectures designed to learn maps between infinite-dimensional function spaces. Neural operators represent an extension of traditional artificial neural networks, marking a departure from the typical focus on learning mappings between finite-dimensional Euclidean spaces or finite sets.

  10. Exchange operator - Wikipedia

    en.wikipedia.org/wiki/Exchange_operator

    In quantum mechanics, the exchange operator , also known as permutation operator, is a quantum mechanical operator that acts on states in Fock space. The exchange operator acts by switching the labels on any two identical particles described by the joint position quantum state . [1]

  11. Particle number operator - Wikipedia

    en.wikipedia.org/wiki/Particle_number_operator

    In quantum mechanics, for systems where the total number of particles may not be preserved, the number operator is the observable that counts the number of particles. The following is in bra–ket notation: The number operator acts on Fock space. Let. be a Fock state, composed of single-particle states drawn from a basis of the underlying ...