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Less-than is asymmetric, not antisymmetric #67736

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merged 1 commit into from
Jan 3, 2020
Merged

Less-than is asymmetric, not antisymmetric #67736

merged 1 commit into from
Jan 3, 2020

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taralx
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@taralx taralx commented Dec 30, 2019

This has bothered me for a while. It's such a small nit, but...

This has bothered me for a while. It's such a small nit, but...
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r? @sfackler

(rust_highfive has picked a reviewer for you, use r? to override)

@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Dec 30, 2019
@sfackler
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I believe the documentation is correct - less-than is an antisymmetric relation: https://en.wikipedia.org/wiki/Antisymmetric_relation.

@taralx
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taralx commented Dec 31, 2019

<= is antisymmetric. < is asymmetric.

antisymmetric: if a <= b and b <= a, then a = b.

asymmetric: if a < b then not b < a.

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Ah right.

@bors r+ rollup

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bors commented Dec 31, 2019

📌 Commit d935a26 has been approved by sfackler

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Dec 31, 2019
Centril added a commit to Centril/rust that referenced this pull request Jan 1, 2020
Less-than is asymmetric, not antisymmetric

This has bothered me for a while. It's such a small nit, but...
@RalfJung
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RalfJung commented Jan 2, 2020

Asymmetry is a property of a single relation though, whereas really here we are talking about three related relations (heh). Not sure what the best terminology is there. But yeah, "asymmetric" seems to fit better than "antisymmetric".

Cc #50230

Dylan-DPC-zz pushed a commit to Dylan-DPC-zz/rust that referenced this pull request Jan 2, 2020
Less-than is asymmetric, not antisymmetric

This has bothered me for a while. It's such a small nit, but...
Dylan-DPC-zz pushed a commit to Dylan-DPC-zz/rust that referenced this pull request Jan 2, 2020
Less-than is asymmetric, not antisymmetric

This has bothered me for a while. It's such a small nit, but...
bors added a commit that referenced this pull request Jan 2, 2020
Rollup of 5 pull requests

Successful merges:

 - #67636 (allow rustfmt key in [build] section)
 - #67736 (Less-than is asymmetric, not antisymmetric)
 - #67762 (Add missing links for insecure_time)
 - #67777 (Use self profile infrastructure for -Z time and -Z time-passes)
 - #67807 (Use drop instead of the toilet closure `|_| ()`)

Failed merges:

r? @ghost
JohnTitor added a commit to JohnTitor/rust that referenced this pull request Jan 3, 2020
Less-than is asymmetric, not antisymmetric

This has bothered me for a while. It's such a small nit, but...
bors added a commit that referenced this pull request Jan 3, 2020
Rollup of 10 pull requests

Successful merges:

 - #67450 (Allow for setting a ThinLTO import limit during bootstrap)
 - #67595 (Suggest adding a lifetime constraint for opaque type)
 - #67636 (allow rustfmt key in [build] section)
 - #67736 (Less-than is asymmetric, not antisymmetric)
 - #67762 (Add missing links for insecure_time)
 - #67783 (Warn for bindings named same as variants when matching against a borrow)
 - #67796 (Ensure that we process projections during MIR inlining)
 - #67807 (Use drop instead of the toilet closure `|_| ()`)
 - #67816 (Clean up err codes)
 - #67825 (Minor: change take() docs grammar to match other docs)

Failed merges:

r? @ghost
@bors bors merged commit d935a26 into rust-lang:master Jan 3, 2020
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5 participants