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In mathematics and mathematical logic, a metatheory is a mathematical theory about another mathematical theory. (Source: Wikipedia)

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State of art for observational equality, on the injectivity requirement

I am reading through the papers, "Observational equality: Now for good" (${TT}^{obs}$) and "Impredicative Observational Equality" (${CC}^{obs}$) by Pujet and Tabareau, and I am trying to understand a …
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