Lambert W Function (hp-42s)

[Werner]

(10-01-2020 12:33 PM)Albert Chan Wrote:  I don't like testing special cases, if I can avoid it.

Nor do I; we all have our preferences. I don't like the fact that this solution depends on RAD mode, for instance ;-) I don't immediately see a way out of that.

9
1/X
1/X
FP
X^2
STO+ ST X
SQRT

is a bit too long for comfort. Perhaps

9
1/X
1/X
FP
LN1+X

Werner