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gr-qc2018★ 1 cited
"Plane" electromagnetic wave in spatially flat Friedman universe
Bernard Jancewicz
The electromagnetic theory is, to a large extend, metric independent. Before the metric is introduced, it is called premetric electrodynamics. Metric enters the constitutive relati…
gr-qc1998
Answer to Question 55: Are there pictorial examples that distinguish covariant and contravariant vectors?
Bernard Jancewicz
We present pictorial means of distinguishing contravariant vectors (or simply vectors) from covariant vectors (or linear forms). When one depicts vector as the directed segment, th…