Abstract This paper reproduces the introductory talk of the workshop in which we presented several hot points of today astrophysics, which have been discussed in details during the workshop. We would like to demonstrate that the improvement on knowledge of the physics of the Universe is strictly related with multifrequency studies of diffuse and discrete cosmic sources.
Keywords Multifrequency Astrophysics: cosmology, clusters of galaxies, AGNs, GRBs, radio pulsars, millisecond pulsars, cosmic counterparts of γ-ray sources
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