To be able show that the StateMonad is a monad, you need to be able to prove equality of two instances of classes. Even I only know that this can be done using tactic ext and don't how this can be done in Arend w/o tactics. Add more hints to the exercise.
To be able show that the
StateMonadis a monad, you need to be able to prove equality of two instances of classes. Even I only know that this can be done using tacticextand don't how this can be done in Arend w/o tactics. Add more hints to the exercise.