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

On 12.10.2024 21:19, joes wrote:

Am Sat, 12 Oct 2024 20:13:11 +0200 schrieb WM:

What is counting? Seriously.

Counting is multiplying by (n+1)/n-

 

Satz: Jede Menge, die mindestens drei Elemente enthält (nennen wir
diese Mengen DE), enthält drei Elemente gemeinsam mit allen DE-Mengen.
Es gibt also drei Elemente, die in allen DE-Mengen enthalten sind. Das
ist ein erlaubter Quantorentausch.

A quantifier shift is never valid.

I am not interested in what you find valid. I am satisfied if my
reasoning cannot be contradicted by counterexample.

But that's too easy.

No, it is what counts.

Why are you posting?

I obtain lots of good ideas from these discussions. Example: Who has ever thought about doubling all natural numbers?
Regards, WM