Improper Integrals with the HP-15C LE & CE

[Voldemar]

(11-18-2023 03:32 AM)lrdheat Wrote:  On my CASIO fx-991CW, using endpoints of 5*10^-19 to 1, the integration, after ~13.4 seconds produces 1.999999999 The CASIO must try using the zero endpoint if the endpoints are entered from 0 to 1 as it will throw a math error. This ~$20 calculator uses 21, sometimes 22 digits in it’s calculations.

Casio fx-991ES (three generations older than fx-991CW), 0 to 1 error, 0.00000001 to 1, about a minute, result 1.9998