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'''Suspension''' is a construction passing from a map to a flow. Namely, let <math>X</math> be a metric space, <math>f:X\to X</math> be a continuous map and <math>r:X\to\mathbb{R}^+</math> be a function (roof function or ceiling function) bounded away from 0. Consider the quotient space
 
:<math>X_r=\{(x,t):0\le t\le r(x),x\in X\}/(x,r(x))\sim(fx,0). </math>
 
The suspension of <math>(X,f)</math> with roof function <math>r</math> is the semiflow<ref>M. Brin and G. Stuck, ''Introduction to Dynamical Systems'', Cambridge University Press, 2002.</ref> <math>f_t:X_r\to X_r</math> induced by the time-translation <math>T_t:X\times\mathbb{R}\to X\times\mathbb{R}, (x,s)\mapsto (x,s+t)</math>.
 
If <math>r(x)\equiv 1</math>, then the quotient space is also called the [[mapping torus]] of <math>(X,f)</math>.
 
==References==
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[[Category:Dynamical systems]]

Revision as of 16:57, 14 December 2013

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Suspension is a construction passing from a map to a flow. Namely, let X be a metric space, f:X→X be a continuous map and r:X→ℝ+ be a function (roof function or ceiling function) bounded away from 0. Consider the quotient space

Xr={(x,t):0≤t≤r(x),x∈X}/(x,r(x))∼(fx,0).

The suspension of (X,f) with roof function r is the semiflow[1] ft:Xr→Xr induced by the time-translation Tt:X×ℝ→X×ℝ,(x,s)↦(x,s+t).

If r(x)≡1, then the quotient space is also called the mapping torus of (X,f).

References

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  1. ↑ M. Brin and G. Stuck, Introduction to Dynamical Systems, Cambridge University Press, 2002.