the matrix and complex ops are beautiful ..

e.g. pi is %-1 (i is _-1)
M M? is matrix multiply and inverse
&|M is matrix rotation
..
euclid, fibonacci, eratosthenes, syracuse, .. all trivial
polynomials, madhava, taylor, ..

vade mecum              name
~+-*%&|<>= !@? #_^ ,$.  ~not &|(and/min or/max) !@?(mod at find) #_^(take drop cut)
~+-*%_ &|^<>?= #!@ ,$.  ~not &|(flip flop) *%_(exp log sqrt) ^<>(order asc desc) ?=(unique group) #!@(count index first)

*%-1 exp   log  (rotate)
&|M  flip  flop (rotate)
<>V  asc   desc (rank)
#!2  count index
@,2  first list
~'~\ diff integral e.g. mode:|/-'!~' mode:@>#'=
-'+\ diff integral
%'*\ diff integral
f'g\ f-delta g-scan
f/g  f-reduce g-map
c/\ split join  c/c\"2,3"
i/\ code decode 2/2\5

V V? at find
M M? at find(matmul inverse)

2#3_!6 take drop
,/2^!6 cut  cat

c$$3 type$string
2!!3 mod!index
n..D key.value

.=%x+.y  madhava/cotes/euler
|!\4 6 euclid
|+\3 2 pingala(fibonacci)
..  madhava(napier/newton/taylor/..)
|/n#'~!' eratosthenes
(2!)(2?)/1+3* syracuse

80:+-*%&|<>=~$!@?#_^, [x][fF]['/\] [cCiIeE]['/\] lxyz (log2 cos sin tan)