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 Nov27 awarded Notable Question Jul2 awarded Curious May14 comment Converting HeavisideTheta[]s and Sign[]s functions to a single Piecewise[] Done. Actually it's not a quartic strictly speaking, but while solving the equation in order to find the zeroes, you get a quartic and so you get 4 solutions in the end. May14 revised Converting HeavisideTheta[]s and Sign[]s functions to a single Piecewise[] added 140 characters in body May14 comment Converting HeavisideTheta[]s and Sign[]s functions to a single Piecewise[] No, they are not. Some of them are quartic, however it's possibile to find the zeroes of each one analytically. May14 asked Converting HeavisideTheta[]s and Sign[]s functions to a single Piecewise[] May14 awarded Commentator May14 comment Is Mathematica really getting this limit wrong? Thank you very much Daniel. Just one additional question: why is everyone saying that the limit should go unevaluated? Isn't Sign[A] a correct result? May13 accepted Is Mathematica really getting this limit wrong? May13 asked Is Mathematica really getting this limit wrong? Mar1 comment Non-linear integral equation @george2079: it should converge, at least it is eq. 5 in this paper: journals.aps.org/prl/pdf/10.1103/PhysRevLett.74.1633 The authors refer to an unpublished paper for the numerical part, commenting as follows: letting $x=tan(\beta)$, we set up a Gaussian-quadrature grid for $\beta$ and convert the above equations into a matrix form which can be solved iteratively. The logarithmic singularities are treated separately. Feb28 revised Non-linear integral equation deleted 4 characters in body Feb28 comment Non-linear integral equation I edited the question to include some more details! Thank you for your links! Feb28 revised Non-linear integral equation added 167 characters in body Feb28 answered Apply a function to each element of a list and sum it Feb28 asked Non-linear integral equation Feb26 awarded Notable Question Feb25 answered Using an ellipse as a threshold for Nearest function Dec27 asked Interactive plot with checklist Dec19 awarded Popular Question