Symbols for homeomorphic, isomorphic, homotopic

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  • #1
quasar987
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My professor seems to randomly use the symbols [itex]\approx[/itex], [itex]\cong[/itex] and [itex]\simeq[/itex] to denote either homeomorphic, isomorphic or homotopic. So, what is the official symbol for each?
 

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  • #2
dextercioby
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I don't think there's a universal convention for the first and the third, but in group theory "isomorphic to" is denoted by [itex] \simeq [/itex].
 
  • #3
matt grime
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Isomorphic is more frequently [itex]\cong[/itex], though the latex tag for it is cong. The symbol Dexter gave is actually in my experience likely to beused for homotopic, though I also see [itex]\sim[/itex] a lot as well.
 
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I have never used a text in which the author used a symbol for these concepts without first defining it.
 
  • #5
quasar987
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No doubt, but the question is: which symbol did they use for each concept?
 
  • #6
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No doubt, but the question is: which symbol did they use for each concept?
That's what my post was meant to convey: there is no standard convention and so each author sets up his text to so that the symbol he likes most is used most frequently.
 

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