  We show that some experimentally observed features of vortex matter in high
temperature superconductors may be interpreted in simpler ways than it is
usually done. In particular, we consider magnetic flux creep at low
temperatures as well as the irreversibility line in the H-T phase diagram. We
also discuss a new approach to the analysis of the equilibrium magnetization in
the mixed state of type-II superconductors and we suggest an alternative
configuration for the mixed state in magnetic fields close to the upper
critical field.
