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CUBE RECOUVREMENT [1 record]

Record 1 1999-09-16

English

Subject field(s)
  • Computer Graphics
  • Mathematics
DEF

A mesh unit of lattice spacing (i.e. surface).

CONT

The number of nonempty boxes of a non-uniform growing Cantor set is a Fibonacci number.

CONT

Strictly speaking, the definitions given for mathematical fractals in 2.2 and 2.3 are valid only if there is an equivalence between the scaling observed by covering the structure with a lattice of boxes (box counting) and using boxes of increasing size centered on the same point (sandbox method). This equivalence exists only for uniform fractals with no multifractal spectrum of their mass distribution.

CONT

In the transformation known as "horseshoe diffeomorphism" the mapping on the unit square is defined so that the upper and lower halves of the square be mapped onto the two arms of the horseshoe.

Key term(s)
  • box counting
  • sandbox method
  • box lattice

French

Domaine(s)
  • Infographie
  • Mathématiques
DEF

Unité de mesure d'une surface.

CONT

Soit K une partie du plan dont on veut mesurer l'étendue. Pour chaque valeur entière de n considérons la grille du plan formée des droites n= i/n et y= j/n où i et j varient dans l'ensemble des entiers relatifs. Cette grille donne lieu à des carrés de côté 1/n. Pour Bouligand un carré est une maille utile si ce carré rencontre K.

OBS

La mesure qui se prête le mieux au calcul numérique de l'étendue d'une courbe irrégulière est la méthode des mailles utiles de Bouligand. Le terme "case" est parfois employé comme synonyme.

Key term(s)
  • case

Spanish

Campo(s) temático(s)
  • Gráficos de computadora
  • Matemáticas
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