Infinity
From NARS2000
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.
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