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## Main Question or Discussion Point

I read only the overview that Kaluza Klein is a 5D theory, in which EM and GR are linked...but can somebody tells me how this is done, since from EM laws, you can, i thought make them covariant by replacing derivatives by covariant ones...(the ones including elements of the metric tensor)...so i think it should be someting like : EM energy should be taken into account as itself modifiyng the metric through the GR field equ, but it's not clear (at least for me), how E and B (or the covariant EM tensor), can be put into only one more dimesion...do you know if the corresponding metric in 5D is singular, since I don't understand how you can displace your self in the EM field, which is of another nature than the space-time dimensions...