revisiting mathoverflow

[juan_gandhi]

https://mathoverflow.net/questions/171809/building-a-product-of-two-categories 

It was a pretty legit question, but Doctor Wofsey says it's off-topic, and all categories are based on sets; seems like, in his view all theories are based on sets.

So, what should we do with a bunch of idiots pretending to be mathematicians? I don't know. I'm not one. But neither are they.

Reasked.

Comments

[vit_r]

Слово "nulla" ни чем не хуже комбинации "XXI". Впрочем, я объяснять не буду. Мне влом на английский переходить. Он переводит меня в другой режим.

[sassa_nf]

It's noticeable when sexagesimal system has signs for all numbers 1..59, but not 0.

It's noticeable when a positional system has a sign for 0 for a missing place-value (like, to mark zero units in 10), but does not use it for zero.