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  2. E8 (mathematics) - Wikipedia

    en.wikipedia.org/wiki/E8_(mathematics)

    The 112 roots with integer entries form a D 8 root system. The E 8 root system also contains a copy of A 8 (which has 72 roots) as well as E 6 and E 7 (in fact, the latter two are usually defined as subsets of E 8). In the odd coordinate system, E 8 is given by taking the roots in the even coordinate system and changing the sign of any one ...

  3. Root system - Wikipedia

    en.wikipedia.org/wiki/Root_system

    The root system E 7 is the set of vectors in E 8 that are perpendicular to a fixed root in E 8. The root system E 7 has 126 roots. The root system E 6 is not the set of vectors in E 7 that are perpendicular to a fixed root in E 7, indeed, one obtains D 6 that way. However, E 6 is the subsystem of E 8 perpendicular to two suitably chosen roots ...

  4. An Exceptionally Simple Theory of Everything - Wikipedia

    en.wikipedia.org/wiki/An_Exceptionally_Simple...

    "An Exceptionally Simple Theory of Everything" [1] is a physics preprint proposing a basis for a unified field theory, often referred to as "E 8 Theory", [2] which attempts to describe all known fundamental interactions in physics and to stand as a possible theory of everything.

  5. E8 - Wikipedia

    en.wikipedia.org/wiki/E8

    E 8, an exceptional simple Lie group with root lattice of rank 8; E 8 lattice, special lattice in R 8; E 8 manifold, mathematical object with no smooth structure or topological triangulation; E 8 polytope, alternate name for the 4 21 semiregular (uniform) polytope; Elementary abelian group of order 8

  6. E8 lattice - Wikipedia

    en.wikipedia.org/wiki/E8_lattice

    The name derives from the fact that it is the root lattice of the E 8 root system. The norm [1] of the E 8 lattice (divided by 2) is a positive definite even unimodular quadratic form in 8 variables, and conversely such a quadratic form can be used to construct a positive-definite, even, unimodular lattice of rank 8.

  7. E7 (mathematics) - Wikipedia

    en.wikipedia.org/wiki/E7_(mathematics)

    An alternative (7-dimensional) description of the root system, which is useful in considering E 7 × SU(2) as a subgroup of E 8, is the following: All () permutations of (±1,±1,0,0,0,0,0) preserving the zero at the last entry, all of the following roots with an even number of + ⁠ 1 / 2 ⁠

  8. Experimental system - Wikipedia

    en.wikipedia.org/wiki/Experimental_system

    In scientific research, an experimental system is the physical, technical and procedural basis for an experiment or series of experiments. Historian of science Hans-Jörg Rheinberger defines an experimental system as: "A basic unit of experimental activity combining local, technical, instrumental, institutional, social, and epistemic aspects."

  9. Root - Wikipedia

    en.wikipedia.org/wiki/Root

    A true root system consists of a primary root and secondary roots (or lateral roots). the diffuse root system: the primary root is not dominant; the whole root system is fibrous and branches in all directions. Most common in monocots. The main function of the fibrous root is to anchor the plant.