PlanetMath (more info)
 Math for the people, by the people. Sponsor PlanetMath
Encyclopedia | Requests | Forums | Docs | Wiki | Random | RSS  
Login
create new user
name:
pass:
forget your password?
Main Menu
sections
Encyclopædia
Papers
Books
Expositions

meta
Requests (236)
Orphanage
Unclass'd (1)
Unproven (540)
Corrections (49)
Classification

talkback
Polls
Forums
Feedback
Bug Reports

downloads
Snapshots
PM Book

information
News
Docs
Wiki
ChangeLog
TODO List
Copyright
About
References to 'topological invariant'
1. diameter by drini
2. fundamental group by yark
3. Gauss-Bonnet theorem by rspuzio
4. genus of topological surface by Mathprof
5. homology by mathcam
6. Lusternik-Schnirelmann category by juanman
7. mathematical programs in quantum gravity by bci1
8. quantum field state on the tetrahedron by bci1