@mcnees
beautiful! I'm embarrassed to say that I was not familiar with it, so I'm either not "of a certain age" or maybe a little further to the spacetime engineering (Weinberg, index-heavy) end of the GR spectrum

Reviewing my Group Theory text from college, and am feeling a little overwhelmed by all the vocabulary I need to (re)learn. Often they are just new technical definitions for "normal" English words.

In the first chapter alone, we are introduced:
set
subset
coset
class
group
subgroup
element
composition
associative
commutative
transposition
distributive
induction
inverse
identity
abelian
symmetric
permutation
closure
generate
cyclic
infinite cyclic
order
isomorphism
homomorphism
automorphism
bijective
surjective
injective
conjugate
inclusion
kernel
image
normal
center
scalar
special linear
partition
transitive
reflexive
congruence
equivalence
product
quotient
projection
residue
class
ring

@mcnees why are there so many blue stars in such an old GC?

@mcnees our group did a heist one-off last year where they were all Muppets, crashing a c.1980 Star Wars holiday party at Skywalker Ranch to steal their MoJo back.

@mcnees in 5e he would be an eldritch knight. Definitely a skilled fighter

This is the binary black hole animation I made for Black Hole Week 2021 and the reason I joined twitter at the time. So I guess it is fitting to start with it here.

Testing GIF upload