Re: [isabelle] HOL-Word contains trivial lemmas

> Auto solve_direct: The current goal can be solved directly with
>   HOL.TrueI: True
>   Word_Miscellaneous.z1pdiv2': True
>   Word_Miscellaneous.z1pmod2': True
> The definitions of these lemmas are:
> lemmas z1pmod2' = zero_le_one [THEN pos_zmod_mult_2, simplified]
> lemmas z1pdiv2' = zero_le_one [THEN pos_zdiv_mult_2, simplified]

This forward-transformation style with a volatile background context is
inherently brittle and should be avoided.

In the HOL-Word theories, there are indeed plenty opportunities for



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