The a b/c key

[Han]

(03-08-2017 08:14 PM)math7 Wrote:  Thanks Joe, Oh I understand now, this is interesting. How do you know all that the CAS uses continuous fractions and the START MODE uses the PDQ algorithm (I do not know what it means)? Those things I have not seen in the manual !!!

You can read about it here: https://en.wikipedia.org/wiki/Continued_fraction (as for the name PDQ, that is likely "p divided by q").