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3Â¥: Originally posted by xzczd at 2015-02-10 20:22:25
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L = D - a^4 # &;
DSolve[U == L, ...

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L = D[#, {x, 4}] - a^4 # &;
DSolve[U[x] == L[u[x]], u[x], x] // Simplify

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2Â¥: Originally posted by Á÷À˵Äɰ at 2015-02-10 17:08:38
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