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7 votes
0 answers
195 views

What was the first proof assistant with eta equality for records?

The Agda language supports eta equality for (non-(co)inductive) record types: ...
Jesper's user avatar
  • 506
22 votes
2 answers
409 views

In what intensional type theories can absurdity be made definitionally proof irrelevant?

Various type theories have, over the years, explored extending the definitional equality with a variety of eta-laws and various forms of proof irrelevance. Quite a lot of systems manage eta for ...
pigworker's user avatar
  • 771
8 votes
1 answer
287 views

When should I use `no-eta-equality` in Agda records?

In a recent development, I used the no-eta-equality attribute on a record. The motivation in that case was ad hoc: I noticed that I'd get better metavariable ...
James Wood's user avatar
  • 1,053