premise: Jack Frost is the name of two unrelated fictional characters appearing in American comic books published by Marvel Comics. The first Jack Frost was published by Marvel's 1940s forerunner Timely Comics during the period fans and historians call the Golden Age of comic books.
hypothesis: Jack Frost, the first instance, was published by Golden Age Comics during a timely period in the 1940s
reason: The statement I wrote specifically states that the first instance of Jack Frost was published by Golden Age Comics.  This is incorrect since it was created by Timely Comics.