Sentence 1: The Hopf theorem is a statement in differential topology , saying that the topological degree is the continuous homotopy invariant of only maps to spheres .
Sentence 2: The Hopf - Theorem is a statement in the differential topology which states that the topological degree is the only homotopy - invariant of continuous maps to spheres .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?