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Jan 20, 2019 at 22:21 history edited Bill Watts CC BY-SA 4.0
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Jan 20, 2019 at 7:11 history edited Bill Watts CC BY-SA 4.0
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Jan 19, 2019 at 12:14 comment added xzczd There're little tails at the end points in the graphic of solapprox because I've truncated the summation at $n=10$ (C -> 10). If e.g. C -> 60 is used, the tails will be almost invisible. And, it's possible to prove my solution is identical to the one found by method of separation of variables, see my update.
Jan 19, 2019 at 9:01 history answered Bill Watts CC BY-SA 4.0