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Add partial 2sq development in iset.mm #4388

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merged 13 commits into from
Nov 14, 2024
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jkingdon
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The lemmas for 2sq intuitionize with few or no changes until we get to 2sqlem11 which depends on things we don't have yet. Although #4387 if merged would partially close that gap, it doesn't have lgsqr and m1lgs which are used by the 2sqlem11 proof.

Given that, it seems better to merge what I have now rather than keep it sitting on a long-lived branch where no one else can easily see it.

Stated as in set.mm.  The proof is similar to the set.mm proof but needs
some intuitionizing.
Stated as in set.mm.  The proof needs a small amount of intuitionizing
but is only slightly changed from the set.mm proof.
Stated as in set.mm.  The proof needs a small amount of intuitionizing
but is basically the set.mm proof.
Stated as in set.mm.  The proof needs a small amount of intuitionizing
but is basically the set.mm proof.
Stated as in set.mm.  The proof needs some intuitionizing but is
basically the set.mm proof.
Stated as in set.mm.  The proof needs a little bit of intuitionizing but
is basically the set.mm proof.
Stated as in set.mm.  The proof needs a little bit of intuitionizing but
is basically the set.mm proof.
Add 2sqlem11 and 2sq to mmil.html

Don't refer to 2sq in comments because we haven't proved it yet.
@jkingdon
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The force-push just now was to rebase and resolve merge conflicts.

I think I'll merge this once tests pass to avoid further merge conflicts including perhaps with #4391 .

@jkingdon jkingdon merged commit 10f7dab into metamath:develop Nov 14, 2024
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@jkingdon jkingdon deleted the 2sq branch November 14, 2024 21:08
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3 participants