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• 38 Empty intersection and empty union
• 15 Cross product in $\mathbb R^n$
• 10 If $u_i$ are affinely independent, are they also linearly independent?
• 5 Memorizing the identities $\cos {\pi \over 3}=\sin {\pi \over 6} = {1 \over 2}$
• 5 Is there a geometric insight from this exercise?
• 5 Inequality $|e^z -1| \le 2 |z|$ for complex $z$ with $|z|\le1$
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