antidifferentiating applications, start kinematics & light/matter ref

diff --git a/methods/calculus.md b/methods/calculus.md
index fb3761fef5a7f5d388d3a3c9322bb385104516c3..c28a4984c384a834a0888aeaa0e38bd366217e9b 100644 (file)
--- a/methods/calculus.md
+++ b/methods/calculus.md
@@ -77,3 +77,18 @@ Normal line for point $P(q,r)$ on function $f$ is $y=mx+c$ where $m={-1 \over m_
 
 Stationary where $m=0$.  
 Find derivative, solve for ${dy \over dx} = 0$
+
+### Type of stationary points
+
+![](https://cdn.edjin.com/upload/RESOURCE/IMAGE/78444.png)
+
+**Local maximum at point $A$**  
+- $f^\prime (x) > 0$ left of $A$
+- $f^\prime (x) < 0$ right of $A$
+
+**Local minimum at point $B$**  
+- $f^\prime (x) < 0$ left of $B$
+- $f^\prime (x) > 0$ right of $B$
+
+**Stationary** point of inflection at $C$
+