Problem 7

Problem 8

• [x] A. This is the standard way of writing out a $\text{span}\{\}$
• [ ] B. This produces the empty set $\empty$ because of "for all"
• [x] C. It produces the same line of $y=x$
• [x] D. Apparently this is also valid
• [ ] E. Is an equation, not a set
• [ ] F. Is also not a set
• [x] G. The span look the same as the line $y=x$
• [x] H. The definition of a span is the set of all linear combinations
• [ ] I. Is not a set