ENTER↑ is a misnomer, long live ENTER:

[Les Bell]

(07-08-2014 04:07 AM)kakima Wrote:  I admit x^2 wasn't the best example I could have given. What about 3.7 + ln(3.7) ? Or 3.7 + sin(3.7) ?

I admit these are contrived examples, designed solely to pick on the "never" in the earlier post.

No problem - your point was fine; those situations do come up, but of course this ENTER isn't optional - it's there to copy the "3.7" on the stack because we want to perform two operations on it without keying it twice. It's something we do without even thinking about it.