Help/Advice requested.

Some people I am working with want to set up a "chat app". Currently I don't use one, but others with whom I would like to "chat" are already using Signal, so that seems to be the obvious choice.

So far so good.

But one person who I would like to be in the new group says that he hasn't been able to get Signal to work.

Apparently Signal claims it wants/needs to send an SMS, but can't.

As yet I have no other information, but does that sound familiar to anyone?

(1/n)

Seen on the blue site, and thought people here might be able to assist:

"Latex query: I want the Universal Quantifier $\forall$ to look exactly like an upsidedown A... but it doesn't. It looks fainter (different font?). Ideas? Thanks."

Suggestions?

So: when you see theorems first read the statements, wrap your mind around them and see why all the hypotheses are needed. But if you want to get good at proving stuff, try to prove them! If you get stuck, read the proofs and learn the methods. Build your skills.

(9/n, n = 9)

Here's a good article by Ehrlich with a lot more detail, and other characterizations of the surreal numbers:

http://qcpages.qc.cuny.edu/~rmiller/Ehrlich.pdf

It seems people working on them use NBG set theory to work with proper classes. Someone should redo this work using universes!

(5/n, n = 5)

Namely, the surreal numbers can be defined by a universal property! For starters, they're an ordered field that's not a set, but a proper class. They contain any ordered field that's a mere set. And the universal property is explained here:

(3/n)

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@feditips that's the most ridiculous complaint. Do what you feel is best.

If they feel that strongly about it, your account isn't for them and they can unfollow it.

Carry on with your good work. You're great.

Indeed, the number of atoms in a gram of hydrogen is about 6 × 10²³. (You may have heard of Avogadro's number - this is roughly that.)

So Boltzmann's constant gives a hint that matter is made of atoms - and even better, a nice rough estimate of how many per gram!

(7/n, n = 7)

I only say this because I'm reading a (journal!) paper with silly mistakes in it early on, and can't help but wonder what else is wrong with the paper.

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Fulltime freelance provider of outreach and enhancement in maths ... I talk a lot. About maths.

I talk about other stuff too, like ballroom dancing, juggling, unicycling, education, engineering, software, and "other things".

But mostly about maths.

I tend to follow back, but only if you have something in your profile.

Joined Apr 2017