I've noticed this several times. I have to assume it's a bug.
When using symbolics to solve for a variable, Prime 3.1 swaps out my defined variable with the built-in variable. In this case, gamma (ratio of specific heats) is replaced with Euler's constant. The good news is the color of the variable changes so I've at least got a clue it's happening. But it shouldn't happen, right? In this case it's unitless (or units cancel) so I didn't even get crazy units to point out a problem. Is there a modifier to prevent this?
And it brings up another question, is there a way to turn off built-in constants? (except for pi and e, ideally) While I understand they are useful, on several occasions I've gotten 'wrong' answers because of a mixup. (e.g. sigma = Stefan-Boltzman instead of stress). Admittedly my fault but I'd rather get an error if I haven't defined 'h' rather than it jumping to Planck's constant. When trying to advocate for Mathcad this is one of the little things that makes me question my choice; a new and uncautious user could easily get the wrong number.
Thanks,
