Collection of Science Jokes P2

[fresh_42]

Cayley's theorem, which says that any group is isomorphic to a certain subgroup of that group's group of isomorphisms.

Do you have a quote? I know Cayley as $G \leq \operatorname{Sym}_{|G|}$ in the finite case.

 

[nrqed]

Do you have a quote? I know Cayley as $G \leq \operatorname{Sym}_{|G|}$ in the finite case.

https://en.wikiversity.org/wiki/Introduction_to_Category_Theory/Monoids

 

[fresh_42]

https://en.wikiversity.org/wiki/Introduction_to_Category_Theory/Monoids

Thanks, and yes, that's the proof, but I don't see that $f_a$ are isomorphisms, only bijections! E.g. $f_a(1)=a \stackrel{i.g.}{\neq}1$. That was my problem: permutations are no homomorphisms. We have $G \longrightarrow \operatorname{Sym}(G)$ not $\operatorname{Aut}(G)$. If we restricted ourselves to conjugations, we would get all central elements in the kernel, so that doesn't work. Where are the automorphisms?

All we have are automorphisms in the category $\mathcal{Set}$ but this is a very misleading wording in this context, and to say "its isomorphisms" is wrong - at least as far as I know.

 

[DennisN]

The Time Stephen Met Jim Carrey

from http://www.boredpanda.com/funny-stephen-hawkings-jokes/

 

[jack action]

 

[Ibix]

That explains global warming, too!

Anthropomorphic global warming.

 

[DennisN]

 

[fresh_42]

View attachment 233019

Don't forget the paper! We were supposed to save paper!

 

[DrClaude]

Don't forget the paper! We were supposed to save paper!

Actually, I think that we have reached a point of diminishing paper. I basically no longer get any paper invoices and I read the newspapers online. Looking at the students, more and more are buying the textbooks as e-books and many assignments go directly from their computer to mine with no wood-derived product in-between.

 

[mjc123]

Except in between their ears...?
No, I'm sure your students are better than that!

 

[fresh_42]

Actually, I think that we have reached a point of diminishing paper.

All diagrams I can find on the internet are $O(t)$ since 1950. I haven't found a worldwide chart and the ones I've found ended in 2005 or so, which is why I don't post them. Yes, some paper traffic has gone electric, but the vast majority of papers are the n-th copy of a meeting protocol, the 10th-copy of a joke going around in emails, or the private copies of anything. Paper is still cheap and everybody is a Gutenberg. A few online invoices don't change the trend.

 

[Keith_McClary]

I haven't found a worldwide chart and the ones I've found ended in 2005

https://www.statista.com/statistics/270317/production-volume-of-paper-by-type/
Definition:

Graphic papers products are all around you and can be found in almost any home, office or business. These include a very wide variety of paper products for uses such as newspapers, inserts, supplements, A4 copy paper and printer paper, book paper, envelopes, forms, writing pads, high-quality magazines and brochures, company magazines, catalogues and annual reports.

 

[fresh_42]

 

[DennisN]

View attachment 233384

@Greg Bernhardt , when will PF/Latex support hieroglyphs?

 

[BillTre]

Yeah!
And Mayan codex too!

 

[Bandersnatch]

@Greg Bernhardt , when will PF/Latex support hieroglyphs?

Haven't you noticed? It already does:

$$H(g,\kappa) = H_{\phi,\kappa} + H_{\psi,\kappa} + g\colon\bar{\psi}\phi\psi\colon - \delta m^2(g,\kappa) - E(g,\kappa)$$

I think it says: 'Ptolemy was here', but Ptah only knows.

 

[fresh_42]

@Greg Bernhardt , when will PF/Latex support hieroglyphs?

 

[DennisN]

Yeah!
And Mayan codex too!

 

[Keith_McClary]

Have we done
Math with Bad Drawings
I’m Going on a Random Walk

 

[256bits]

That's funny.
He better be back before his supper gets cold, or if he's lucky maybe she will keep it warm in the oven.

 

[DarMM]

Haven't you noticed? It already does:

I think it says: 'Ptolemy was here', but Ptah only knows.

It's the Hamiltonian for the Yukawa theory, fairly standard QFT, you'd see it in intro books.

 

[Bandersnatch]

Oh, humour. That elusive beast.

 

[DarMM]

Oh, humour. That elusive beast.

I know it's a joke Mr. Silly, just thought I'd explain what it actually was.

 

[fresh_42]

https://www.scoopnest.com/user/cari...u-heard-of-pavlov-s-cat-via-bad-science-jokes

 

[Keith_McClary]

I’m Going on a Random Walk

In case this is not in your Physics curriculum:

Once again, however, our focus is on simple diffusion or the nearest-neighbor random walk. For these processes, the possibility of a diffusing particle making arbitrarily large excursions before certain trapping takes place leads to an infinite mean lifetime. On the other hand, the recurrence of diffusion in one dimension means that the particle must eventually return to its starting point. This dichotomy between infinite lifetime and certain trapping leads to a variety of extremely surprising first-passage-related properties both for the semi-infinite interval and the infinite system.

Section 3.1 (and the referenced Chapters 1-2).

 

[fresh_42]

 

[DrGreg]

In the UK there is a TV programme for very young children called Peppa Pig. One episode is about spiders and reassures viewers that spiders are very small and can't hurt you.

When the series was exported to Australia, that episode was banned.

Ref: Peppa Pig 'spiders can't hurt you' episode pulled off air in Australia – again

 

[fresh_42]

In the UK there is a TV programme for very young children called Peppa Pig. One episode is about spiders and reassures viewers that spiders are very small and can't hurt you.

When the series was exported to Australia, that episode was banned.

Yes, if I should ever be bitten by a spider, I hope it happens north of the Alps!

 

[davenn]

In the UK there is a TV programme for very young children called Peppa Pig. One episode is about spiders and reassures viewers that spiders are very small and can't hurt you.

When the series was exported to Australia, that episode was banned.

Ref: Peppa Pig 'spiders can't hurt you' episode pulled off air in Australia – again

hahaha, I was unaware of that ... what most people ( and obviously those who produced that TV prog) don't realize, is that the smaller spiders tend to be more venomous than the larger onesDave

 

[Keith_McClary]

https://bizarro.com/daily-comic/?fd=2018-11-18

 

[scottdave]

Some things are funny because they are true.
http://pearlsofrawnerdism.com/life-and-maths/

 

[davenn]

 

[jim mcnamara]

https://www.gocomics.com/nonsequitur/2018/11/22

 

[davenn]

https://www.gocomics.com/nonsequitur/2018/11/22

hahaha

 

[DrClaude]

https://www.gocomics.com/nonsequitur/2018/11/22

Spoiler

It's called a rake