A negative real number, i.e., a real number 
for which 
,
is said to be a negative number. Negative numbers are written with an explicit leading
minus sign.
Negative Number
See also
Minus Sign, Negative, Negative Part, Positive NumberExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Negative Number." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/NegativeNumber.html