# Differences

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activities:guides:vfvring 2015/08/15 12:36 activities:guides:vfvring 2019/06/03 13:18 current
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-==== Activity: Wrap-up ====
-  * Discuss which variables are variable and which variables are held constant - Students frequently think of anything represented by a letter as a `variable' and do not realize that for each particular situation certain variables remain constant during integration. For example students frequently do not see that the \$R\$ representing the radius of the ring is held constant during the integration over all space while the r representing the distance to the origin is varying. Understanding this is something trained physicists do naturally while students frequently don't even consider it. This is an important discussion that helps students understand this particular ring problem and also lays the groundwork for better understanding of integration in a variety of contexts. For more information on this topic, see [[whitepapers:variables:start|Students understanding of variables and constants]].
+==== Activity: Wrap-up ====
+
+  * Discuss which quantities are variable and which variables are held constant - Students frequently think of anything represented by a letter as a `variable' and do not realize that for each particular situation certain quantities remain constant during integration. For example students frequently do not see that the \$R\$ representing the radius of the ring is held constant during the integration over all space while the r representing the distance to the origin is varying. Understanding this is something trained physicists do naturally while students frequently don't even consider it. This is an important discussion that helps students understand this particular ring problem and also lays the groundwork for better understanding of integration in a variety of contexts. For more information on this topic, see [[whitepapers:variables:start|Students understanding of variables and constants]].
+  * Emphasize that while one may not be able to perform a particular integral, the power series expansion of that integrand can be integrated **term by term**.

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