Merging or division. I. Dependencies between the magnitude gap of groups
  and the morphology of two brightest galaxies
  In the present study, the dependences of the morphological types of the first
and second ranked group galaxies on the magnitude gap were studied.
  It is shown that there is no increase in the relative number of elliptical
galaxies among the first and second ranked group galaxies with a large
magnitude gaps (in comparison with the expected, assuming that the
morphological type of these galaxies does not depend on the magnitude gap).
This result contradicts the merger hypothesis. The hypothesis proposed by
Ambartsumian does not contradict this result.
