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--- lecture_17_slides [2017/04/03 15:32] – [Example] rupert
+++ lecture_17_slides [2017/04/03 15:34] (current) – [Corollary] rupert
@@ Line 225: / Line 225: @@
   * So $\vv\cdot\ww=\|\vv\|\,\|\ww\|\cos\theta$. ■
-==== Corollary ====
+==== Corollary 1 ====
 If $\vv$ and $\ww$ are non-zero vectors and $\theta$ is the angle between them, then $\cos\theta=\displaystyle\frac{\vv\cdot\ww}{\|\vv\|\,\|\ww\|}$.
-==== Corollary ====
+==== Corollary 2 ====
 If $\vv$ and $\ww$ are non-zero vectors with $\vv\cdot\ww=0$, then $\vv$ and $\ww$ are **orthogonal**: they are at right-angles.