| Square Root | %: 0 0 0 | Root | 
| %: y is the square root of y . 
If y is negative, the result is an imaginary number.  
For example, %:-4 ↔ 0j2 . | x %: y is the x root of y . 
Thus, 3%:8 is 2, and 2%:y 
is %:y . In general, x %: y ↔ y^%x . | 
   y=: i. 7
   y
0 1 2 3 4 5 6
   2 %: y
0 1 1.41421 1.73205 2 2.23607 2.44949
   %: y
0 1 1.41421 1.73205 2 2.23607 2.44949
   r=: 1 2 3 4
   z=: r %:/ y
   z
0 1       2       3       4       5       6
0 1 1.41421 1.73205       2 2.23607 2.44949
0 1 1.25992 1.44225  1.5874 1.70998 1.81712
0 1 1.18921 1.31607 1.41421 1.49535 1.56508
          
   r ^~ z                     See agreement in Section II B, and note use of ~
0 1 2 3 4 5 6
0 1 2 3 4 5 6
0 1 2 3 4 5 6
0 1 2 3 4 5 6