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  2. Quantum entanglement - Wikipedia

    en.wikipedia.org/wiki/Quantum_entanglement

    Quantum entanglement is the phenomenon of a group of particles being generated, interacting, or sharing spatial proximity in a manner such that the quantum state of each particle of the group cannot be described independently of the state of the others, including when the particles are separated by a large distance.

  3. HIARCS - Wikipedia

    en.wikipedia.org/wiki/HIARCS

    HIARCS is a proprietary UCI chess engine developed by Mark Uniacke. [1] Its name is an acronym standing for higher intelligence auto-response chess system.Because Hiarcs is written portable in C, it is available on multiple platforms such as Pocket PC, Palm OS, PDAs, iOS, Microsoft Windows and Mac OS X.

  4. Order-6-4 triangular honeycomb - Wikipedia

    en.wikipedia.org/wiki/Order-6-4_triangular_honeycomb

    In the geometry of hyperbolic 3-space, the order-6-infinite triangular honeycomb is a regular space-filling tessellation (or honeycomb) with Schläfli symbol {3,6,∞}. It has infinitely many triangular tiling , {3,6}, around each edge.

  5. Atomic packing factor - Wikipedia

    en.wikipedia.org/wiki/Atomic_packing_factor

    Each corner atom touches the center atom. A line that is drawn from one corner of the cube through the center and to the other corner passes through 4r, where r is the radius of an atom. By geometry, the length of the diagonal is a √ 3. Therefore, the length of each side of the BCC structure can be related to the radius of the atom by

  6. Electron shell - Wikipedia

    en.wikipedia.org/wiki/Electron_shell

    In chemistry and atomic physics, an electron shell may be thought of as an orbit that electrons follow around an atom's nucleus.The closest shell to the nucleus is called the "1 shell" (also called the "K shell"), followed by the "2 shell" (or "L shell"), then the "3 shell" (or "M shell"), and so on further and further from the nucleus.

  7. Urelement - Wikipedia

    en.wikipedia.org/wiki/Urelement

    In type theory, an object of type 0 can be called an urelement; hence the name "atom". Adding urelements to the system New Foundations (NF) to produce NFU has surprising consequences. In particular, Jensen proved [ 5 ] the consistency of NFU relative to Peano arithmetic ; meanwhile, the consistency of NF relative to anything remains an open ...

  8. Atom (measure theory) - Wikipedia

    en.wikipedia.org/wiki/Atom_(measure_theory)

    Given a measurable space (,) and a measure on that space, a set in is called an atom if > and for any measurable subset , either () = or () = (). [ 1 ] The equivalence class of A {\displaystyle A} is defined by [ A ] := { B ∈ Σ : μ ( A Δ B ) = 0 } , {\displaystyle [A]:=\{B\in \Sigma :\mu (A\Delta B)=0\},} where Δ {\displaystyle \Delta ...

  9. Atom (order theory) - Wikipedia

    en.wikipedia.org/wiki/Atom_(order_theory)

    In the mathematical field of order theory, an element a of a partially ordered set with least element 0 is an atom if 0 < a and there is no x such that 0 < x < a. Equivalently, one may define an atom to be an element that is minimal among the non-zero elements, or alternatively an element that covers the least element 0 .