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--- classes:2009:fall:phys4101.001:q_a_1021 [2009/10/23 08:16] – ludeman
+++ classes:2009:fall:phys4101.001:q_a_1021 [2009/10/23 10:34] (current) – jbarthel
@@ Line 19: / Line 19: @@
 === Dark Helmet 10/22 ===
 Depending on your degree of sarcasm, i am either just as excited as you or much less excited than you. :)
+===Captain America 10-23===
+I'm pumped!
 ====Hydra====
@@ Line 172: / Line 175: @@
 ===Spherical===
 Maybe, as Griffiths says, I shoulda been a mathematician...  I realize he's not explicitly mentioning a delta function, it just sounds like what he refers to "could be" a delta function as well...  but ya.  It's just not. Is a delta function "square integrable"? -- Yes because it has an 'area' yes?
+===liux0756===
+The 'isolated points' the footnote related is talking about points with finite values. Of course delta function is not square integrable, because <math>\int_{-\infty}^{+\infty} \delta(x)^2 dx = \int_{-\infty}^{+\infty} \delta(x) \delta(x) dx =\delta(0) = + \infty </math> (equation [2.113])
 ====Daniel Faraday 10/22 10:30pm====