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Nov 18, 2012 at 8:09 comment added Robert Israel OK, but the case $K=0$ is left as an exercise.
Nov 18, 2012 at 5:44 comment added user5810 "We may assume WLOG that $\: K=1 \:$" $\;\;$ except when $\: K=0 \:$. $\;\;\;\;$
Nov 18, 2012 at 5:19 history answered Robert Israel CC BY-SA 3.0