A tensor product of generalized algebraic theories (Cartmell-style dependent type theories) is constructed syntactically and proved to yield a theory, recovering Lawvere tensor products, double categories, diagrams, and displayed structures as special cases.
The logic of structures
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A monoidal category of dependently sorted algebraic theories I: syntax
A tensor product of generalized algebraic theories (Cartmell-style dependent type theories) is constructed syntactically and proved to yield a theory, recovering Lawvere tensor products, double categories, diagrams, and displayed structures as special cases.