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Full Version: A kind of slog ? C + SUM f_n(x) ln^[n](x) ?
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I was thinking about C + f_1(x) ln(x) + f_2(x) ln^[2](x) + f_3(x) In^[3](x) + ...

This should make a kind of slog. Or the similar : abel function for 2sinh(x).
Similar question for C + f_1(x) arc2sinh(x) + f_2(x) arc2sinh^[2](x) + ...

Regards

tommy1729
For instance f_n(x) could be a gauss-like erf function with tops at sexp(n).

regards

tommy1729