I studied mathematics fifty years ago. I have forgotten much of what I learned. there is an anecdote however that one of my maths lecturers told that I would dearly love to know more about. He stated that in some of Gauss' theorems he wrote something like "it clearly follows that" but it did not clearly follow to those coming after him. This lecturer said that his assertion was trusted but that some of those logical jumps took a very long time to be proved by others. Back then in the early 1970s it was even implied that there were a few that had not yet been proved. Now this might be a complete myth but if there is any truth in it I would very much like to know and more specifically which theorems this appeared in. Many thanks Chris Milton