Topologio esas fako di matematiko koncernanta dal studio di nevarianta propraji di spaco e di ensemblo di funcioni, pos kontinua deformo (extensita sen lacerinta o glutininta).
Topologio introduktis nova geometriala linguo.
Topologio precipue koncernas shablono; to esas, ta traiti ne efikata di chanji di grandeso, angulo ec.
Videz anke problemo di la quar kolori, Klein-botelo, Mobius-strio.geometrio
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