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by practal 24 days ago
> Even more important than lemmas are observations, but that is another story.

In my book about abstraction logic (http://abstractionlogic.com) I have definitions, theorems, lemmas, and even observations :-) Just did a count of the frequency. Of course, not sure what those frequencies say about the relative importance.

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Definitions 78

Theorems 20

Lemmas 76

Observations 41