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Jul
2
awarded  Curious
May
14
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.
May
14
revised Converting HeavisideTheta[]s and Sign[]s functions to a single Piecewise[]
added 140 characters in body
May
14
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.
May
14
asked Converting HeavisideTheta[]s and Sign[]s functions to a single Piecewise[]
May
14
awarded  Commentator
May
14
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?
May
13
accepted Is Mathematica really getting this limit wrong?
May
13
asked Is Mathematica really getting this limit wrong?
Mar
1
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at least it is eq. 5 in this paper: journals.aps.org/prl/pdf/10.1103/PhysRevLett.74.1633 The authors refer to an unpublished paper for the numerical part, commenting as follows: letting $x=tan(\beta)$, we set up a Gaussian-quadrature grid for $\beta$ and convert the above equations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.
Feb
28
revised Non-linear integral equation
deleted 4 characters in body
Feb
28
comment Non-linear integral equation
I edited the question to include some more details! Thank you for your links!
Feb
28
revised Non-linear integral equation
added 167 characters in body
Feb
28
answered Apply a function to each element of a list and sum it
Feb
28
asked Non-linear integral equation
Feb
26
awarded  Notable Question
Feb
25
answered Using an ellipse as a threshold for Nearest function
Dec
27
asked Interactive plot with checklist
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19
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30
asked How to change the LabelStyle only for one axis?