Raising 0 by a negative exponent would imply division by 0, so it is left undefined.
The symmetric form is used to allow negative exponents, if the magnitude of X is less than 1.
For a motivation of the negative exponent see the substitution formula in the odd case.
Allowing negative exponents provides a canonical form for positive rational numbers.
Adding in a bias to account for negative exponents means that the exponent field must be at least 12 bits wide.
Symbols for derived units formed by division are joined with a solidus (/), or given as a negative exponent.
A similar development with negative exponents results in (1 - d) clefts on the inside of a ring.
He didn't avoid fractional exponents; only negative exponents don't appear in his work.
In fact, any rational number can be written uniquely as the product of primes if negative exponents are allowed.
On decel, our exponential curve has a negative exponent.