Prominent cryptographers Adi Shamir and Ross J. Anderson were both denied visas to travel to the US (for a conference and a book awards ceremony respectively). In https://www.schneier.com/blog/archives/2019/05/why_are_cryptog.html Bruce Schneier mentions "two other prominent cryptographers who are in the same boat". Odd and troubling.
Also discussed at https://boingboing.net/2019/05/17/denying-cryptographers-problem.html
@11011110 on our last family trip to US, to Berkeley, on J1 visas, the embassy in London insisted on interviewing our, at that time not even 3 y.o. son, in person. And us being non-dodgy EU citizens, who went to US many times, and my wife not just visited, but did a PhD in Princeton... These admin screwups smell of utter incompetence and over-bureaucratisation of the system.
A Mastodon instance for maths people. The kind of people who make \(\pi z^2 \times a\) jokes.
\) for inline LaTeX, and
\] for display mode.