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| (* The basic theory of Lawvere-Tierney operators and sheafification in logical form. | |
| This formalization is based on: | |
| Barbara Veit: A proof of the associated sheaf theorem by means of categorical logic, | |
| The Journal of Symbolic Logic , Volume 46 , Issue 1 , March 1981 , pp. 45–55 | |
| DOI: https://doi.org/10.2307/2273255 | |
| *) | |
| Require Import Utf8. |