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Qu'est-ce (qui) est quartic$66083$ - définition

Lamé's Special Quartic; Lame's special quartic; Lame special quartic; Lamé special quartic; Lame's Special Quartic
  • Lamé's special quartic with "radius" 1.

Klein quartic         
  • The tiling of the quartic by reflection domains is a quotient of the [[3-7 kisrhombille]].
  • Dually, the Klein quartic is a quotient of the dual tiling, the [[order-3 heptagonal tiling]].
  • An animation by [[Greg Egan]] showing an embedding of Klein’s Quartic Curve in three dimensions, starting in a form that has the symmetries of a tetrahedron, and turning inside out to demonstrate a further symmetry.
  • The fundamental domain of the Klein quartic. The surface is obtained by associating sides with equal numbers.
  • The eight functions corresponding to the first positive eigenvalue of the Klein quartic. The functions are zero along the light blue lines. These plots were produced in [[FreeFEM++]].
  • A pants decomposition of the Klein quartic. The figure on the left shows the boundary geodesics in the (2,3,7) tessellation of the fundamental domain. In the figure to the right, the pants have each been coloured differently to make it clear which part of the fundamental domain belongs to which pair of pants.
  • The [[small cubicuboctahedron]] is a polyhedral immersion of the tiling of the Klein quartic with octahedral symmetry.
  • ''The Eightfold Way'' – sculpture by [[Helaman Ferguson]] and accompanying book.
COMPACT RIEMANN SURFACE OF GENUS 3
Klein Quartic; Klein's quartic curve; Klein curve
In hyperbolic geometry, the Klein quartic, named after Felix Klein, is a compact Riemann surface of genus with the highest possible order automorphism group for this genus, namely order orientation-preserving automorphisms, and automorphisms if orientation may be reversed. As such, the Klein quartic is the Hurwitz surface of lowest possible genus; see Hurwitz's automorphisms theorem.
Igusa quartic         
In algebraic geometry, the Igusa quartic (also called the Castelnuovo–Richmond quartic CR4 or the Castelnuovo–Richmond–Igusa quartic) is a quartic hypersurface in 4-dimensional projective space, studied by .
Quartic reciprocity         
COLLECTION OF THEOREMS IN ELEMENTARY AND ALGEBRAIC NUMBER THEORY THAT STATE CONDITIONS UNDER WHICH THE CONGRUENCE X⁴ ≡ P (MOD Q) IS SOLVABLE
Biquadratic reciprocity; Biquadratic Reciprocity Theorem
Quartic or biquadratic reciprocity is a collection of theorems in elementary and algebraic number theory that state conditions under which the congruence x4 ≡ p (mod q) is solvable; the word "reciprocity" comes from the form of some of these theorems, in that they relate the solvability of the congruence x4 ≡ p (mod q) to that of x4 ≡ q (mod p).

Wikipédia

Lamé's special quartic

Lamé's special quartic, named after Gabriel Lamé, is the graph of the equation

x 4 + y 4 = r 4 {\displaystyle x^{4}+y^{4}=r^{4}}

where r > 0 {\displaystyle r>0} . It looks like a rounded square with "sides" of length 2 r {\displaystyle 2r} and centered on the origin. This curve is a squircle centered on the origin, and it is a special case of a superellipse.

Because of Pierre de Fermat's only surviving proof, that of the n = 4 case of Fermat's Last Theorem, if r is rational there is no non-trivial rational point (x, y) on this curve (that is, no point for which both x and y are non-zero rational numbers).