newRPL: The complexity of complex mode

[Claudio L.]

(08-22-2016 03:03 PM)Nigel (UK) Wrote:  Does this help?

Nigel (UK)

The first part of your post really helped. Later you suggested we don't need to take care of this, but then you go into details on how every operation should be handled, so I'm exactly as I was before. Lots of special cases to take care of on every operation, and I'm still not sure if it's needed or not.

But once we allow directed infinities to exist (and for a future CAS this should be the case), we are forced to define a result for each operator, on each special case.
Some cases like (+∞,3) or (∞,∞) could be rejected as syntax error to enforce some discipline on the user and reduce the number of cases.