Question: tildes all over again

I want to ask about a small problem. I will present a paper at a conference in February. Because it involves time consuming calculations of numerical solutions for several onerous systems, I will do the calculations at home before the talk, save the results, and show the output to the conference. The folks attending the conference are not necessarily Maple Folks, so I do not want to have to explain the tilde after characters for which I have made assumptions. Of course, I know about

interface(showassumed=0);

After making the calculations here at home, traveling to the meeting, opening the file to make the presentation then, alas, the tildes are back again. Try this.

> assume(a, real):
> interface(showassumed=0):
> equa:=a^2+a-1;

Run this file. No tilde. Close the file saving the output. Open the file. There is the tilde after each “a".

My question:is there some way to make the tilde stay gone when I save such a file and reopen it without recalculation the worksheet?