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Feb 18, 2010 at 3:19 history edited Tim Perutz CC BY-SA 2.5
Slightly more precision.
Feb 17, 2010 at 23:59 comment added Petya Thank you, Tim! It is exactly what I need. My proof is longer - I considered pairs like $(M,M\S^{\lambda})$ and it requires to study cases...
Feb 17, 2010 at 23:55 history edited Tim Perutz CC BY-SA 2.5
Reversed effect of previous edit.
Feb 17, 2010 at 23:54 vote accept Petya
Feb 17, 2010 at 23:49 history answered Tim Perutz CC BY-SA 2.5