Maple is missing the 'standard' notation for the cumulative normal distribution and uses the error function instead (for historical reasons I guess).

However that would be quite convenient to read and formulae in a common notation.

The following code allows to convert notations from erf to the usual one, either cdfN or N (usage may depend a bit on whether one already defined a function N). The technique (and the kind of coding) is discussed at Maple Primes in September 2007, I just applied it for me needs, the link is www.mapleprimes.com/blog/doug-meade/trigonometric-conversions-sincos-and-sectan (Sept 2007).

It does not work perfectly (i.e: does not show up in desired final form), but it satisfies my needs (if I am not in ungracious mood).

Here is the Maple sheet for download: www.mapleprimes.com/files/102_convert_cdfN.mws