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Original Message (ID '43259') By Bill Simpson:
Mathematica treats the exact integer number 1 differently from the approximate floating point number 1. Approximate numbers are indicated by including a decimal point. So "Va ->.0005 (-10000. - 1. deltaR)" means to substitute for all Va the approximate .0005 times the expression (approximate 1000. - approximate 1.0 times deltaR) For many simple tasks there is little difference between using approximate and exact numbers, but for some problems this makes considerable difference.