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Dec 8, 2021 at 21:18 comment added username The initial observation of this formula for checkerboards (and rotations) is due to J. B. Keller "A theorem on the conductivity of a composite medium" 1964. The formula for 4 color checkerboards is also known.
Apr 8, 2017 at 13:34 history bumped CommunityBot This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
Mar 9, 2017 at 13:13 history bumped CommunityBot This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
Feb 7, 2017 at 13:12 history edited Denis Serre CC BY-SA 3.0
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Feb 7, 2017 at 9:55 history edited Denis Serre CC BY-SA 3.0
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Feb 6, 2017 at 15:41 history asked Denis Serre CC BY-SA 3.0