Re: [isabelle] More use of "-" and "!" in isabelle 2009-1?



Hi Rafal,

> next
>   case (Cons x xs)
>   from prems have ...
> 
> instead of
> 
> next
>   case (Cons x xs)
>   hence ...
> ?

n.b. "hence" = "from this"

i.e. you explicitly chain in the facts of the "case".  This is indeed a
recommended proof style in such situations.

Hope this helps,
	Florian

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