Re: [isabelle] Unable to prove easy existential "directly"

On Fri, 19 Jul 2013, Tobias Nipkow wrote:

Don't worry, it is alive and kicking.

According to canonical jargon on this mailing list, "old fashioned" means it is not even "legacy" yet. It just means old-fashioned.

Nonetheless, there is no reason to encumber new learners of Isar with old habits drawn from Mizar. The latter cannot even use "then obtain ..." or "obtain ... then". I also want to do Mizar justice in avoiding confusion of its "hence" and "thus" that have a quite different meaning there.


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