In my calculations I have a variable (say
z) which can be an argument of
Under some conditions,
z = x-y, where:
x = a + c; y = b + c; a = 4.24835*10^-18; b = -4.24835*10^-18; c = 1.3956*10^18;
By default Mathematica considers both
4.24835*10^-18 == -4.24835*10^-18 == 0
and this leads to
x = y = 1.3956*10^18 and, hence,
z = 0 and
z Log[z] = Indeterminate.
How can I prevent this and make sure it does not happen elsewhere?