Timeline for Evaluating the integral $\int_{-\infty}^\infty \frac {dx}{\cos x + \cosh x}$
Current License: CC BY-SA 3.0
3 events
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| May 30, 2015 at 1:55 | comment | added | robjohn♦ | @PeterHalburt finite sums and integrals can be switched. Since infinite sums are limits, as are integrals, care must be taken. Sometimes switching the order of limits affects the outcome. | |
| Oct 9, 2014 at 19:20 | comment | added | Peter Halburt | Ron, why do you ask whether sum and integral can be switched? Of course they can, summation is associative. | |
| Feb 6, 2013 at 11:27 | history | answered | Ron Gordon | CC BY-SA 3.0 |