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    Conjecture   Is there a graph  that is a minor-minimal obstruction for two non-orientable surfaces?
 that is a minor-minimal obstruction for two non-orientable surfaces? 
 that is a minor-minimal obstruction for two non-orientable surfaces?
 that is a minor-minimal obstruction for two non-orientable surfaces? | Recomm. for undergrads: no | 
| Posted | by: | Bruce Richter | 
| on: | March 27th, 2007 | 
 that is a minor-minimal obstruction for two non-orientable surfaces?
 that is a minor-minimal obstruction for two non-orientable surfaces?