Question: in 1940 hopf was on the list of the invited lecturers to the international congress of mathematicians to be held in cambridge, massachusetts.
Answer: --> In 1940 Hopf was on the list of the invited lecturers to the International Congress of Mathematicians to be held in Cambridge, Massachusetts.

Question: radius of headland turning is considerably reduced
Answer: --> Radius of headland turning is considerably reduced

Question: butter can be an especially rich source of activator x when it comes from cows eating rapidly growing grass in the spring and fall seasons.
Answer:
--> Butter can be an especially rich source of Activator X when it comes from cows eating rapidly growing grass in the spring and fall seasons.