Entity Modelling

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Dependent Type Structure

Figure 17
A model of a system of dependent types.
Figure 18
Dependent type reference to scope triangle.
Figure 19
Scope diagram for substituting into a variable type - an example of a scope square which is also a pullback.
Figure 20
Scope diagram for substituting actuals for formals in a function - also a pullback diagram.
Figure 21
An extended model including construction of types using existential and universal quantifiers.