TIB: More about = on the 85/86
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TIB: More about = on the 85/86
On the TI-85/86, the = sign is used to define functions. Sure al of you
know that. However, it is _also_ used for comparisons. This is a
little trickier, since you might accidentally define a variable instead
of comparing functions. When you put functions on both sides of the =
sign on the command, the calculator returns the difference between them;
it returns 0 when the epressions are equal because both sides cancel out
completely. This is clearly different from the test function == and it
also explains why you get a completely different answer when you
accidentally use = in its place.
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