| Negative Sign and Infinity | _ |
|
The symbol _ followed by a digit denotes a negative number
(as in _3.4), and denotes infinity when used alone,
or negative infinity (in __). It is also used in names,
as discussed in
Part I and in
Part II Section I.
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2 % 0 Two divided by zero _ 10 ^. 0 Base ten logarithm of zero __ _2 _ 3 + 5 3 _ 8 integer_test=: =<. Use of break in name integer_test 3 3.5 1 0Although -2 may sometimes be used instead of _2, it is important to understand that the former is the application of a function to the number 2, whereas the symbol _ is an indivisible part of the number representation, just as the period is an indivisible part of a number such as 8.9 .