twist boundary - meaning and definition. What is twist boundary
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What (who) is twist boundary - definition

DIVIDING LINE BETWEEN TWO AREAS OR SETS OF POINTS IN A TOPOLOGICAL SPACE; DIFFERENCE BETWEEN THE CLOSURE AND THE INTERIOR
Boundary point; Boundary points; Frontier (mathematics); Boundary component; Boundary set; Frontier (topology); Boundary (algebraic topology); Boundary of a set; Boundary Functions; Boundary (mathematics); Topological boundary; Boundary (geometry)
  • Boundary of hyperbolic components of [[Mandelbrot set]]
  • A set (in light blue) and its boundary (in dark blue).

Twist, Arkansas         
  • File:Twist AR 3.jpg
  • File:Twist AR 2.jpg
  • File:Twist AR 1.jpg
HUMAN SETTLEMENT IN ARKANSAS, UNITED STATES OF AMERICA
Twist, AR
Twist is an unincorporated community in Cross County, Arkansas, United States. Twist was named after a nearby plantation of the same name.
Boundary (topology)         
In topology and mathematics in general, the boundary of a subset of a topological space is the set of points in the closure of not belonging to the interior of . An element of the boundary of is called a boundary point of .
K/T boundary         
  • Luis]] (left) and his son [[Walter Alvarez]] (right) at the K-T Boundary in [[Gubbio]], Italy, 1981
GEOLOGICAL SIGNATURE, USUALLY A THIN BAND OF ROCK, MARKING THE TRANSITION FROM THE END OF THE CRETACEOUS PERIOD AND THE BEGINNING OF THE PALEOGENE PERIOD, DATED WITH RADIOMETRIC METHODS, AT THE AGE OF 66.043 ± 0.011 MA
K-T boundary; K-T layer; KT boundary; KT Boundary; Kt boundary; C-T boundary; K/T impact; K-T impact; Cretaceous-Paleogene boundary; K-t boundary; K-T Boundary; K–T boundary extinction mechanisms; K–Pg boundary; K-Pg boundary; K-T boundary extinction mechanisms; K/T boundary; K-T Line; K–T boundary; Cretaceous–Tertiary boundary; Cretaceous-Tertiary boundary
¦ noun Geology the boundary between the Cretaceous and Tertiary periods, about 65 million years ago, marked by the extinction of dinosaurs and many other groups of animals.
Origin
from symbols for Cretaceous and Tertiary.

Wikipedia

Boundary (topology)

In topology and mathematics in general, the boundary of a subset S of a topological space X is the set of points in the closure of S not belonging to the interior of S. An element of the boundary of S is called a boundary point of S. The term boundary operation refers to finding or taking the boundary of a set. Notations used for boundary of a set S include bd ( S ) , fr ( S ) , {\displaystyle \operatorname {bd} (S),\operatorname {fr} (S),} and S {\displaystyle \partial S} . Some authors (for example Willard, in General Topology) use the term frontier instead of boundary in an attempt to avoid confusion with a different definition used in algebraic topology and the theory of manifolds. Despite widespread acceptance of the meaning of the terms boundary and frontier, they have sometimes been used to refer to other sets. For example, Metric Spaces by E. T. Copson uses the term boundary to refer to Hausdorff's border, which is defined as the intersection of a set with its boundary. Hausdorff also introduced the term residue, which is defined as the intersection of a set with the closure of the border of its complement.

A connected component of the boundary of S is called a boundary component of S.