add

From The K Language Wiki
Add
x+y

The add function, generally denoted by +, is used for addition in K.

The add primitive is fully atomic.

 1+2
3

 1 2 3+4 5 6
5 7 9

 ((23;45);(3;4))+((45;78);(9;0))
(68 123
 12 4)