Saran
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 Feb17 comment How to evaluate some parts of an expression inside Hold? I came up with Function[y, Hold[f[x, y]]][y] pretty much immediately after I posted the question. But anyway I think Szabolc's With solution is slightly cleaner. Yes, the thing to replace is always a Symbol, so it's not an exact duplicate of pattern replacement problem. Feb17 asked How to evaluate some parts of an expression inside Hold? Nov20 awarded Teacher Nov20 revised Non-separable partial differential equation in polar coordinates added 30 characters in body Nov20 answered Non-separable partial differential equation in polar coordinates Nov20 comment How to exclude a region from ParametricPlot Perfect! Thanks and apologies for my oversight in looking through the docs. Nov19 awarded Scholar Nov19 awarded Supporter Nov19 accepted How to exclude a region from ParametricPlot Nov19 asked How to exclude a region from ParametricPlot Nov19 comment Non-separable partial differential equation in polar coordinates It seems that NDSolve is sometimes a bit picky when it comes to elliptic equations. Just a quick query: are you sure there is actually a bound state solution for these parameters? I've run Eigensystem on the discretised Schrödinger operator and can't seem to find any sensible solution. Nov17 comment Symbol definition in parallel kernels Also, Association is clearly an appropriate solution here which I will indeed use. However, the question still holds: is there a way to define to a symbol in the way described above from parallel kernels? Nov17 comment Symbol definition in parallel kernels This was exactly what I was looking for before going with the "attching to data" route. Honestly, in my years of using mma I've somehow never come across this rather fundamental built-in. I did try searching for "HashMap in Mathematica" or some such earlier but somehow that yielded nothing useful. Thanks a lot! Nov17 revised Symbol definition in parallel kernels edited title Nov17 asked Symbol definition in parallel kernels Nov11 awarded Yearling Sep24 awarded Autobiographer Apr28 awarded Commentator Apr28 comment Simplifying expression on power I will add to the above that RuleDelayed can be invoked by replacing -> with :>. Feb14 revised Can I tell Simplify to prefer nested polynomials? deleted 195 characters in body; added 3 characters in body