I'm swamped with grading and class preparation, but wanted to comment briefly on the items below:
On Wednesday, February 10, 2021 at 3:58:21 PM UTC-6 asme...@gmail.com wrote: > On Wed, Feb 10, 2021 at 1:44 PM Oscar Benjamin <oscar.j....@gmail.com> > wrote: > > Yes, DivideSides would make sense for unevaluated division of inequalities >> etc. >> >> That is not inconsistent with using + though: We can use eq1+eq2 as a >> shorthand for the evaluated form of AddSides(eq1, eq2). For equations >> that would always be able to evaluate. In Mathematica this is all >> organised around making Boolean expressions that can evaluate after >> substitution. >> > > We can generalize this to applying any function to equations or > inequalities. For equations, it matters where the function either isn't > defined (like y=0 for f(x, y) = x/y), or isn't well-defined (for example, > square roots are multivalued). For inequalities it matters on what parts of > the domain the function is (strictly) monotonic. Except I don't know if > SymPy can really answer either of these questions right now. So this might > have to remain only a theoretical idea for the time being. > > Aaron Meurer > > >> >> Oscar > > I don't see a problem with returning multivalued/multiple equation results. If I understand what you are talking about for expressions where you have an equal sign this is working reasonably in the present implementation. For example a simplified example of a quantum problem my students just did: [image: Screenshot from 2021-02-10 19-58-41.png] The right hand size is of type `Piecewise`. Jonathan -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/a9cd201d-91b2-4bc1-b2fc-4cb0da3801b2n%40googlegroups.com.
