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Jan 22, 2013 at 6:00 comment added Pritam Majumder @Chris godsil: Yes, thats why I said without computing the complement, may be using some arguments on the degrees of verices and using the fact that it is a cartesian product; and this is not a homework.
Jan 21, 2013 at 12:56 comment added Chris Godsil This looks very much like a homework question. One could show $K_3\Box K_3$ was self complementary by a couple of drawings.
Jan 21, 2013 at 7:03 history asked Pritam Majumder CC BY-SA 3.0