Difference between revisions of "4-gradient"
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(Created page with "<center><math>\mathbf \partial_\mu \equiv</math></center>") |
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| − | <center><math>\mathbf \partial_\mu \equiv</math></center> | + | <center><math>\nabla_i=\frac{\partial}{\partial r_i}=\partial_i</math></center> |
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| + | <center><math>\mathbf \partial_\mu \equiv[\frac{\partial}{\partial t}\ \frac{\partial}{\partial x}</math></center> | ||
Revision as of 23:26, 9 July 2017