lispdoc - results for denominator

(denominator number)

Function: Return the denominator of NUMBER, which must be rational.

Example:

(defun rat-denominator (rat)
  "The denominator of a rational expression."
  (typecase rat
    (cons (cdr rat))
    (number (denominator rat))
    (t 1)))

Mentioned in:
CLtL2 - 12.6. Type Conversions and Component Extractions on Numbers
CLtL2 - 22.1.6. What the Print Function Produces
HyperSpec - Function NUMERATOR, DENOMINATOR
Successful Lisp - assert