Problem 1
Begin from the exact definitions, verify all hypotheses, use R(X,Y)Z, distinguish local from global conclusions, and test the result on a standard model and a boundary or counterexample case.
Faculty solution guide
Riemann, Sectional, Ricci and Scalar Curvature
Accept equivalent mathematically correct reasoning. Require explicit definitions, theorem hypotheses, proof structure, verification, and limitations.
Problem 2
Identify the first invalid inference, missing hypothesis, quantifier error, unjustified limit interchange, or unproved existence claim; then supply a valid repair.
Problem 3
A complete response explicitly states the definitions, domain, hypotheses, exact target, and theorem dependencies for Riemann, Sectional, Ricci and Scalar Curvature.
Problem 4
The argument must address organizing curvature contractions and geometric meaning with each nontrivial step justified and the final conclusion restated.
Problem 5
A strong application explains the mathematical model in general relativity, navigation, shape spaces, mechanics, optimization, and machine learning on manifolds, verifies conditions, and names at least one limitation.
Problem 6
Accept a second valid proof, a counterexample showing necessity of a hypothesis, an independent estimate, or a reproducible finite check that is correctly described as supporting evidence.