We use the letter S to denote Surface Area.
This section begins a study into surfaces,
@@ -92,6 +92,17 @@
+
+
+ Recall that function is one to one
+ on its domain if the function never repeats an output value over the domain.
+ In the case of \vec r(u,v) ,
+ \vec r is one to one if \vec r(u_1,v_1) \neq \vec r(u_2,v_2) for all points
+ (u_1,v_1) \neq (u_2,v_2) in the domain of \vec r .
+ one to one
+
+
+
Given a point (u_0,v_0) in the domain of a vector-valued function \vec r ,
the vectors \vec r_u(u_0,v_0) and
@@ -104,17 +115,6 @@
\vec r_v determine a plane that is tangent to \surfaceS .
-
-
- Recall that function is one to one
- on its domain if the function never repeats an output value over the domain.
- In the case of \vec r(u,v) ,
- \vec r is one to one if \vec r(u_1,v_1) \neq \vec r(u_2,v_2) for all points
- (u_1,v_1) \neq (u_2,v_2) in the domain of \vec r .
- one to one
-
-
-
A surface \surfaceS is said to be orientable
orientable
@@ -154,7 +154,7 @@
The Möbius band is a non-orientable surface.
-
+
A Möbius band, a non-orientable surface
A depction of a Möbius band, showing how the normal vector changes direction while traveling around the surface.
diff --git a/ptx/sec_stokes_divergence.ptx b/ptx/sec_stokes_divergence.ptx
index 273dc7179..74f2b0081 100644
--- a/ptx/sec_stokes_divergence.ptx
+++ b/ptx/sec_stokes_divergence.ptx
@@ -42,7 +42,7 @@
-
+
Note: the term outer unit normal vector
used in
diff --git a/ptx/sec_surface_integral.ptx b/ptx/sec_surface_integral.ptx
index 72cf716ad..c619156bc 100644
--- a/ptx/sec_surface_integral.ptx
+++ b/ptx/sec_surface_integral.ptx
@@ -342,7 +342,7 @@
Find the flux of \vec F across \surfaceS .
-
+
The surface and vector field used in
A triangular surface in space, and a vector field flowing across the surface.
diff --git a/ptx/sec_triple_int.ptx b/ptx/sec_triple_int.ptx
index ca832fc06..a783d4bda 100644
--- a/ptx/sec_triple_int.ptx
+++ b/ptx/sec_triple_int.ptx
@@ -613,7 +613,7 @@
using the order of integration dz\, dy\, dx .
Set up the triple integrals that give the volume in the other 5 orders of integration.
-
+
The region D used in
diff --git a/ptx/sec_vector_fields.ptx b/ptx/sec_vector_fields.ptx
index 0ee61ef8f..fcc92631d 100644
--- a/ptx/sec_vector_fields.ptx
+++ b/ptx/sec_vector_fields.ptx
@@ -764,7 +764,7 @@
The third component is the measure of curl of a planar vector field.
-
+
Note that in two dimensions, curl is a scalar quantity,
while in three dimensions, curl is a vector quantity.
@@ -1365,7 +1365,7 @@
\divv \vec F = 0 and \curl \vec F = \vec 0 .
-
+
A vector field representing a planar gravitational force
A radial vector field. Each vector points toward the origin, and vectors near the origin are larger.