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Apr 28, 2015 at 20:16 history edited HNuer CC BY-SA 3.0
Completed the statement $div(\phi)=0$ to include the =0 part. Also added a reminder of what $L_1$ was.
Apr 28, 2015 at 15:59 vote accept 010110111
Apr 28, 2015 at 12:38 history answered HNuer CC BY-SA 3.0