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    $\begingroup$ It should be noted that even if we have reduction rules related to eta-equality, we would usually do expansion instead of contraction, because it leads to better theoretic properties. $\endgroup$
    – Trebor ♦
    Commented Feb 10, 2022 at 7:53
  • $\begingroup$ @GuyCoder it should probably be a synonym $\endgroup$
    – Couchy
    Commented Feb 10, 2022 at 21:32