Explanation:
doing what you're told to do
Yes it's a assertion due to the simple fact that im the statement you have made you have a fact that is given " it was one of the most important equation..." that was a fact that was given
now mind you assertion means a statement of forceful fact or belief
so yess it's a assertion
True. If the author didn't believe it, then they wouldn't write about it. So its true.
