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S Jun 1, 2016 at 11:27 history suggested Sean Lawton CC BY-SA 3.0
Updated formatting, fixed uncomiled TeX, corrected typos.
Jun 1, 2016 at 11:19 review Suggested edits
S Jun 1, 2016 at 11:27
Jul 15, 2011 at 2:28 comment added Ryan Budney I'm voting to close as this is a duplicate of your question on math.stackexchange. See: math.stackexchange.com/questions/51484/…
Jul 14, 2011 at 23:22 comment added Marco Golla I would interpret that as the union of regular neighbourhoods of the single curves: basically a union of bands $S^1\times (-1,1)$, one for each $c_i$, such that the intersection of any two is either empty or a square (i.e. the product of an interval in $S^1$ with $(-1,1)$, with the identification reversing the two factors). The genus count works well in this case.
Jul 14, 2011 at 22:15 history edited Gary CC BY-SA 3.0
Added a new question in last paragraph
Jul 14, 2011 at 21:54 history asked Gary CC BY-SA 3.0