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Interesting to see how this could change payment, collection and monitoring activity.

China Creates Its Own Digital Currency…
From Computational Complexity
#### Why is someone emailing me an offer to apply to be chair?

I recently go the following email (I blocked out identifying information of who send it and what college is involved. I doubt I needed to legally but... you never...

From Computational Complexity
#### COMPUTER PROOF vs computer proof- Quadratic VDW theorem

Quad VDW Theorem: For all c there exists W=W(c) such that for all c-colorings of {1,...,W} there exists a,d such that a and a+d2 are the same color.
What is known...

From Computational Complexity
#### What does it mean for a student to guess an answer?

On my final in Aut Theory I wanted to ask a TRUE/FALSE/UNKNOWN TO SCIENCE
question but did not want them to guess. Hence I had +4 for a right answer, -3 for a wrong...

From Computational Complexity
#### Second of N posts on G4G13. Maybe

(Don't forget to vote for SIGACT posistions:here 9th workshop on Flexible network design, May 22-25 at College Park, here.)
My first poston G4G13 is arguably ...

From Computational Complexity
#### Gahering for Gardner 13 - the first or third of many posts

I attended G4G13 (Gathering for Gardner- meeting 13). Martin Gardner was the Scientific American Mathematical Recreations columnist from 1956 until 1981. He had...

From Computational Complexity
#### The 8 digit number I asked for

(On June 29th, co-located with STOC, there will be a workshop to celebrate Vijay Vazarani's 60th birthday. See here. As computer scientists shouldn't we use 64...

From Computational Complexity
#### Find an 8-digits number such that ....

(June 29th, co-located with STOC, will be a workshop to celebrate Vijay Vazarani's 60th birthday. As computer scientists shouldn't we use 64 as the milestone?here...

From Computational Complexity
#### Is DTIME(n) closed under concat? star? of course not but...

(STOC 2018 will offer child care for the first time. I was emailed the following and asked to
pass it on:
We are pleased to announce that we will provide pooled...

From Computational Complexity
#### Whan a deep theorem of your Uncles becomes standard should you be sad?

(An exposition of Nash-Williams's proof of the Kruskal Tree Theorem is here)
Andrew Vazsonyi (the mathematician, see here, not the folklorist, see here for that...

From Computational Complexity
#### Challenge about NFA for {a^y : y\ne 1000} answered.

Recall that in a prior post I asked
Is there an NFA for { ay : y ≠ 1000 } with substantially less than 1000 states.
I will now show that any NFA for this set...

From Computational Complexity
#### Challenge: Is there a small NFA for { a^i : i\ne 1000} ?

Consider the language
{L = ai : i ≠ 1000 }
There is a DFA for L of size 1002 and one can prove that there is no smaller DFA.
What about an NFA? Either:
...

From Computational Complexity
#### Why do we give citations? How should we give citations?

Why do we cite past work? There are many reasons and they lead to advice on how we should cite past work
Give credit where credit it due. Some people over cite...

From Computational Complexity
#### Wanted: An Easy Proof of a Weak Theorem in NT so that I can get another VDW--> Primes infinite proof to be really easy.

(All math in this article is here)
A while back I posted about a proof that Van Der Waerden's theorem implies the number of primes
is infinite (see the post...

From Computational Complexity
#### When the Wrong People raise the issue

On my discrete math final in Spring 2017 I had a question:
Prove that sqrt(2/3) is irrational.
A student emailed me the folloing (I paraphrase and am prob not...

From Computational Complexity
#### When students are wrong but have a valid point, encourage them

I often have the class VOTE on a statement (the choices are usually TRUE/FALSE/UNKNOWN TO SCIENCE/Stewart-Colbert-2020)
I ask the students who voted incorrectly...

From Computational Complexity
#### The web bad/People using it bad.

I was going to write a post about how hard it was to find what grades mean at different schools (e.g., at UMCP W (for withdraw) means the student dropped the course...

From Computational Complexity
#### A ``new'' ``application'' of Ramsey Theory/A Truly ``bad'' math song

Ian Parberry once told me (though I doubt he originated it- The first link I found says it was Mark Twain)
to a man with a hammer, everything looks like a nail...

From Computational Complexity
#### "How can you use your research for ugrad projects?'- the wrong question

I was helping a math PhD who worked in computable ramsey theory prepare his teaching and research statements for his job application. One of the questions various...

From Computational Complexity
#### Publishing: Why Are We Doing It Right and Other Sciences Aren't?

(NOTE- this is NOT a `we hate Elsevier and the others' post- though I suspect the comments will be about that.)
Alexandra Elbakyan has created a repository ofhere...

From Computational Complexity
#### How many degrees are in a Martian Year?

James Tanton gave a great talk at the JMM (Joint Math Meeting) in San Diego on
how many degrees are in a Martian Year?
but he didn't quite answer his title question...