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Vanilla 1.1.10 is a product of Lussumo. More Information: Documentation, Community Support.
Added references to
Anders Kock, Universal Projective Geometry via Topos Theory , JPAA 9 (1976) pp.1-24.
Anders Kock, Elementwise semantics in categories with pull-backs , arXiv:2004.14731 (2020). (abstract)
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