Re: How many different unit fractions are lessorequal than all unit fractions?

Am 05.10.2024 um 16:58 schrieb Moebius:

Am 05.10.2024 um 15:57 schrieb Alan Mackenzie:
 

I first came across the terms "potential infinity" and "actual infinity"
on this newsgroup, not in my degree course a few decades ago.  I'm not
convinced there is any mathematically valid distinction between them.

 Actually, there is.

"Nearly all research-level mathematicians today (I would guess 99.99% of them) take for granted both "potential" and "completed"  [aka "actual"] infinity, and most probably do not even know the distinction indicated by those two terms."
Source: https://math.vanderbilt.edu/schectex/courses/thereals/potential.html