negative 2
2
19
negative 2
2
20
21
22
How fast is f changing in this direction at P_0, ie the directional derivative?
23
equals
24
We can understand this as a change up or down.
25
26
27
Notice that the direction and the directional derivative together give the tangent line
28
Cross section in some other direction
29
less than or equal to "t" less than or equal to
30
Equation of tangent line in other direction
31
less than or equal to "t" less than or equal to
32
Tangent plane
33
34
Niveaulinien
35
36
negative 5
5
37
38
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