physics - physical constants with subscripts in mathematica -


i have little problem. have searched quite while haven't found answer (help, i'm beginner). want make own notebook physical calculations in mathematica 9. notebook should easy use , 1 should able overview (reason don't want use quantity every single time). want display equations in textbook. problem subscripts need electronmass example. need symbol, because want protect values. doesn't work. can change m , different value electronmass. here's notebook:

needs["notation`"]; symbolize[parsedboxwrapper[subscriptbox["_", "_"]]]  subscript[m, e] = quantity["electronmass"]; subscript[m, p] = quantity["protonmass"]; subscript[m, n] = quantity["neutronmass"]; protect[subscript[m, el], subscript[m, p], subscript[m, n]];

so far good... happens...

in[19]:= m = 5  out[19]= 5  in[20]:= subscript[m, e ]  out[20]= subscript[5, e]

instead want

in[20]:= subscript[m, e ]  out[20]= subscript[m, e]

just treating subscript[m, e] independently has "m" or "e" help

an easy work around protect symbols want use, instead of

protect[subscript[m, el], subscript[m, p], subscript[m, n]];

you need write

protect[m,el,n];

that way once set values

subscript[m, n] = 2; subscript[m, el] = 4;

later when evaluating them guaranteed returned correct values. quick note, might redefine subscript motive, such as

subscript[a_, b_] := a[b]

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