7. A. Explain what it means for a space to have only topological structure.
B. Explain what it means for a space to have topological and affine structure but no metric structure.
C. Suppose you have a space with full metric structure. Describe a further kind of spatial structure the space could have.
8. (3 points) Explain the difference between an enduring space+time picture (the 3+1 view) and a four-dimensional spacetime picture. Explain why adopting the enduring space view immediately commits you to a standard of absolute rest.
