Signs, Double                 SD

NB.      _    -         Signs

   _1 2 3
_1 2 3

   -1 2 3
_1 _2 _3

NB.       ~           double


   +~ 1 2 3     NB. 1 2 3 + 1 2 3
2 4 6

   ^~ 3         NB.  3^3
27

   *~ i. 10
0 1 4 9 16 25 36 49 64 81

