Section 13,42: INTRINSIC

 Specifies that a symbolic name is the name of an intrinsic
 subprogram.  Statement format:

    INTRINSIC v[,v]...

    v  Is the symbolic name of an intrinsic subprogram.

 Subprogram names passed as actual arguments must be identified in
 INTRINSIC statements.  Names of subprograms used as the objects of
 CALL statements or function references do not need to be identified
 by means of INTRINSIC statements; these names are recognized as
 intrinsic implicitly.