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The conversion between Fricas and Sage (ginac) gamma functions has been implemented, but not for bivariate gamma:

sage: fricas.Gamma(3/2)
      3
Gamma(-)
      2
sage: fricas.Gamma(3/2).sage()
1/2*sqrt(pi)

sage: fricas.Gamma(3/2,2)
      3
Gamma(-,2)
      2
sage: fricas.Gamma(3/2,2).sage()
NotImplementedError: The translation of the FriCAS Expression Gamma(3/2,2) to sage is not yet implemented.

Thanks for reporting, let me open a ticket.

The conversion between Fricas and Sage (ginac) gamma functions has been implemented, but not for bivariate gamma:

sage: fricas.Gamma(3/2)
      3
Gamma(-)
      2
sage: fricas.Gamma(3/2).sage()
1/2*sqrt(pi)

sage: fricas.Gamma(3/2,2)
      3
Gamma(-,2)
      2
sage: fricas.Gamma(3/2,2).sage()
NotImplementedError: The translation of the FriCAS Expression Gamma(3/2,2) to sage is not yet implemented.

Thanks for reporting, let me open a ticket.this is now trac ticket 25597