lispdoc - results for = 

(= number &rest more-numbers)
Function: Return T if all of its arguments are numerically equal, NIL otherwise.
Example:
(defun atomic-number-element (atomic-number)
  "Get an element from its atomic number"
  (find-element-if
   (lambda (element)
     (= (element-atomic-number element)
        atomic-number))))
Mentioned in:
CLtL2 - 12. Numbers
CLtL2 - 12.1. Precision, Contagion, and Coercion
CLtL2 - 12.3. Comparisons on Numbers
CLtL2 - 13.2. Predicates on Characters
CLtL2 - 16.1. Hash Table Functions
CLtL2 - 18. Strings
CLtL2 - 26.6. Iteration Control
CLtL2 - 6.3. Equality Predicates
HyperSpec - Function =, /=, <, >, <=, >=
HyperSpec - Function CHAR=, CHAR/=, CHAR<, CHAR>, CHAR<=, CHAR>=, CHAR-EQUAL, CHAR-NOT-EQUAL, CHAR-LESSP, CHAR-GREATERP, CHAR-NOT-GREATERP, CHAR-NOT-LESSP
HyperSpec - Function STRING=, STRING/=, STRING<, STRING>, STRING<=, STRING>=, STRING-EQUAL, STRING-NOT-EQUAL, STRING-LESSP, STRING-GREATERP, STRING-NOT-GREATERP, STRING-NOT-LESSP
On Lisp - An ATN Compiler
On Lisp - Anaphoric Variants
On Lisp - Chapter _28
On Lisp - Extending Lisp
On Lisp - Non-functional Expanders
On Lisp - Operations on Lists
On Lisp - Other Structures
PCL - character comparisons
PCL - generalized assignment
PCL - numeric comparisons
PCL - string comparisons
PCL - the database
PCL - truth falsehood and equality

By Bill Moorier