Re: Suggestions on how to use standard engineering symbols in Mathematica which conflict with Mathematica own symbols?

*To*: mathgroup at smc.vnet.net*Subject*: [mg104101] Re: Suggestions on how to use standard engineering symbols in Mathematica which conflict with Mathematica own symbols?*From*: "David Park" <djmpark at comcast.net>*Date*: Mon, 19 Oct 2009 07:12:15 -0400 (EDT)*References*: <6278953.1255860068980.JavaMail.root@n11>

You could use a MakeBoxes definition. MakeBoxes[mI, form : (StandardForm | TraditionalForm)] := InterpretationBox[#1, #2] & @@ {"I", mI} Then you can enter the moment of inertia as mI but it will display as I in the output and conform with the textbooks. The output also can be copied and pasted. (r + 3) mI I (3 + r) The only possible problem is that you now have some ambiguity in the meaning of I in output expressions. But since E and I get their own special output display maybe it is not too bad. David Park djmpark at comcast.net http://home.comcast.net/~djmpark/ From: Nasser M. Abbasi [mailto:nma at 12000.org] Hello This is a problem I am sure all of us had. It would be nice to use the same standard engineering/physics symbols/letters found in textbook to write the equations in mathematica. But some/many of those symbols conflict with existing Mathemtica symbols. For example, Young modulus is always written as E, but E in mathematica is reserved to the exponential constant, and I would like to use I (upper case I) to mean the moment of inertia, and not have it conflict with complex number I. And many other examples. I was wondering if there is a way to still use these letters in my equations but not conflict with Mathematica's? I thought may be I could make a bold versions of these letters with a new code, or find latine characters which "looks like" these from the palette, but have different ASCII code. Or may be I could tell mathematica somehow to "undefine" these symbols during some computation and restore them again, so it will not interpret them as its own standard symbols only during this computation, but was not sure if this is a good idea? (would this will cause a problem internally to Mathematica as it could very well use these symbols in its own package code. I could always use Exp[] instead of E and use Sqrt[-1] instead of "I" when I really mean to use the Mathematica letters and leave E and I etc... for my use. Any other ideas others have on this subject? I'd really like to write the equations as they appear in the textbook if possible and not have to rename standard engineering letters to something else. --Nasser