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Negative number

A negative number is indicated by a _ (underbar), not a - (minus).

   5 + _3
2
   _7
_7 
   _5e_3
_0.005
   5 - 9
_4
Leaving out the blank between the - and the 9 does not change the meaning.

   5 -9
_4
The - is always a verb. This simplifies the rules for evaluating sentences as there is no special case for - when it is used immediately to the left of a number. But if - is always a verb, then another character, the _ (underbar) is required to spell a negative number.

The _ is used in spelling numbers, along with the digits, dot, and the e for exponential notation; it indicates a negative number.

Remember: _ in front of a number is part of the number and indicates that it is negative, and - is always a verb and is not part of a number.

The __ (two underbars) is negative infinity and is a number.

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