Common Lisp the Language, 2nd Edition
A
subclass inherits methods in the sense that any method applicable to
all instances of a class is also applicable to all instances of any
subclass of that class.
The inheritance of methods acts the same way regardless of whether the method was created by using one of the method-defining forms or by using one of the defclass options that causes methods to be generated automatically.
The inheritance of methods is described in detail in
section 28.1.7.
