rcollyer
Reputation
949
Top tag
Next privilege 1,000 Rep.
Create new tags
 Oct 9 suggested approved edit on Mathematica - How to solve for the equilibrium? Oct 9 comment Mathematica: Specifying assumptions/domains doesn't seem to work? @JandR: As a point of note, Solve changed between v.7 and v.8. In v.7 the third param was for variables to eliminate, and in v.8 it is for the domain. Also, according to the docs, Assuming only affects those functions that have an Assumptions option. So, you have to include your assumptions as extra equations passed to Solve and Reduce, as J.M. shows. Oct 9 awarded Organizer Oct 9 revised Function as parameter in Wolfram Mathematica edited tags Oct 8 awarded Yearling Oct 6 comment “Change of basis” from standard vector space to matrix Lie algebra, and its inverse give me a little time, it is a lot to digest. Oct 6 comment Predicate Logic A similar problem exists in your second statement, since your talking about a politician no one trusts, it should be $\lnot T(y,x)$. Oct 5 revised Help understanding cross-product added align environment to bring eqns within bounding box Oct 5 suggested approved edit on Help understanding cross-product Oct 1 answered “Change of basis” from standard vector space to matrix Lie algebra, and its inverse Sep 29 comment Simple problem with pattern matching in Mathematica I was not aware of RepeatedNull, +1. Sep 29 comment Wave propagation with variable wave speed @lio, you're using first derivatives of $u$ which is not a wave equation. Did you mean $u_{tt} + c(x,t) u_{xx} = 0\;$? Sep 29 comment differentiation of Polynomials I think you've misinterpreted the OPs equation, the $3 x$ only divides the second term. Sep 28 comment Confused about implicit differentiation @Jordan, $dy^{20}/dy = 20 y^{19}$. Sep 27 comment What is the result of $\infty - 1$? +1, for "Cat - 1." Sep 27 awarded Nice Answer Sep 27 revised Pure maths vs applied added additional thoughts. Sep 26 revised Pure maths vs applied added clarifying statement Sep 26 comment Pure maths vs applied If your interested in the use of Lie algebras in quantum, the book by Lipkin is a good read, and it's a Dover reprint! Essentially it shows you how to extract a lot of information from the Hamiltonian by just knowing the operator algebra. Sep 25 comment Do real matrices always have real eigenvalues? @commenter. No, the "iff" is absolutely correct. Please review the fundamental theorem of algebra and the definition of the characteristic polynomial.