Infinity

The two infinities are now valid values to be used as the upper and lower numeric limits. The infinity symbol (∞) is entered from the keyboard using the key combination Alt-f. The other infinity is obtained from the positive form by preceding it with a negative symbol (¯∞).

For example,

      ⌊/⍬
∞

      ⌈/⍬
¯∞

      9*999
∞

      ÷0
∞

      ÷¯∞ ∞
0 0

      ('<',a),a⍪a∘.<a←¯∞ 0 ∞
  < ¯∞ 0 ∞
 ¯∞  0 1 1
  0  0 0 1
  ∞  0 0 0

Also, see the description of the system variable ⎕IC (Indeterminate Control) for a way to control how infinity along with other indeterminates are handled.