Hi, I am a beginner in the field (about halfway through my first course)
and I too think you are right about this being a bug. I think making
`Dagger` a subclass of `Operator`  should work as a hermitian conjugate
should behave as an operator.

On Wed, Jul 1, 2020 at 3:18 AM Aaron Meurer <asmeu...@gmail.com> wrote:

> I don't know enough about the quantum module to know what sorts of
> automatic evaluation would be expected, but this looks like it is a
> bug. Can you open an issue on the issue tracker about it
> https://github.com/sympy/sympy/issues/new
>
> Aaron Meurer
>
> On Mon, Jun 29, 2020 at 11:28 AM Michele Cotrufo
> <michelecotr...@gmail.com> wrote:
> >
> > It worked, thanks!
> >
> > On Sunday, June 28, 2020 at 3:17:15 PM UTC-4, Oscar wrote:
> >>
> >> Hi Michele,
> >>
> >> I don't know the quantum module so well but does qapply work in this
> case?
> >>
> >> Oscar
> >>
> >> On Sat, 27 Jun 2020 at 19:52, Michele Cotrufo <michele...@gmail.com>
> wrote:
> >> >
> >> > Is there a way to specify that the identity operator must act as
> identity also on the adjoint operators?
> >> >
> >> > from sympy.physics.quantum.dagger import Dagger
> >> > from sympy.physics.quantum.operator import Operator
> >> > from sympy.physics.quantum import IdentityOperator
> >> > A = Operators('A')
> >> > Identity = IdentityOperator()
> >> > A * Identity #This gives A, correctly
> >> > B = Dagger(A)
> >> > B * Identity #This returns A^\dagger I . so it does not remove the
> identity operator
> >> >
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