Homotopy and Fundamental Groups in Topology
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HOMOTOPY
•
FUNDAMENTAL GROUP
•
FUNDAMENTAL GROUP OF TORUS
FUNDAMENTAL GROUP OF
TORUS
HOMOTOPY
HOMOTOPY
The torus and the mug are homotopic to each other
HOMOTOPY
Two functions in a topological space can be said to be
homotopic when one can be continuously
transformed into the other.
It is an equivalence relation.
Internal closed paths never change
HOMOTOPY
If objects have same structure, they can be classified as a
class, regardless of their size, shape and dimension.
Fundamental group never changes with dilation or
retraction
Fundamental group – characterizes only loops
FUNDAMENTAL GROUP
The fundamental group of an arc-wise connected set
X
is a group formed by sets of equivalent classes of
set of all loops
Never needs a specific base point
Representation:
π
_1(S)
FUNDAMENTAL GROUP OF TORUS
Product of fundamental group of circle with itself
Representation :
π
_1(T^2)=
π
(S
1
) x
π
(S
1
)
Reason for not considering specific base point:
Existence of homotopy between loops of torus
FUNDAMENTAL GROUP OF TORUS
FUNDAMENTAL GROUP OF TORUS
IDENTITY ELEMENT: Constant path
CLOSURE: f:X Y, g:Y Z, then f*g:X Z
ASSOCIATIVITY: f*(g*h) = (f*g)*h
f: X Y g: Y Z h: Z W
INVERSE: f:X Y, g:Y X, f*g is constant path
THANK YOU
Explore the concepts of homotopy and fundamental groups in topology, where objects with the same structure can be classified into classes, and the fundamental group characterizes loops. Discover the fundamental group of a torus, its identity elements, closure, associativity, and inverses. Homotopy allows for continuous transformations between functions in a topological space, showcasing equivalence relations that remain unchanged with dilation or retraction.
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Presentation Transcript
FUNDAMENTAL GROUP OF TORUS HOMOTOPY FUNDAMENTAL GROUP FUNDAMENTAL GROUP OF TORUS
HOMOTOPY The torus and the mug are homotopic to each other
HOMOTOPY Two functions in a topological space can be said to be homotopic when one can be continuously transformed into the other. It is an equivalence relation. Internal closed paths never change
HOMOTOPY If objects have same structure, they can be classified as a class, regardless of their size, shape and dimension. Fundamental group never changes with dilation or retraction Fundamental group characterizes only loops
FUNDAMENTAL GROUP The fundamental group of an arc-wise connected set X is a group formed by sets of equivalent classes of set of all loops Never needs a specific base point Representation: _1(S)
FUNDAMENTAL GROUP OF TORUS Product of fundamental group of circle with itself Representation : _1(T^2)= (S1) x (S1) Reason for not considering specific base point: Existence of homotopy between loops of torus
FUNDAMENTAL GROUP OF TORUS IDENTITY ELEMENT: Constant path CLOSURE: f:X Y, g:Y Z, then f*g:X Z ASSOCIATIVITY: f*(g*h) = (f*g)*h f: X Y g: Y Z h: Z W INVERSE: f:X Y, g:Y X, f*g is constant path
