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- W2788394322 abstract "We define a simple kind of higher inductive type generalising dependent $W$-types, which we refer to as $W$-types with reductions. Just as dependent $W$-types can be characterised as initial algebras of certain endofunctors (referred to as polynomial endofunctors), we will define our generalisation as initial algebras of certain pointed endofunctors, which we will refer to as pointed polynomial endofunctors. We will show that $W$-types with reductions exist in all $Pi W$-pretoposes that satisfy a weak choice axiom, known as weakly initial set of covers (WISC). This includes all Grothendieck toposes and realizability toposes as long as WISC holds in the background universe. We will show that a large class of $W$-types with reductions in internal presheaf categories can be constructed without using WISC. We will show that $W$-types with reductions suffice to construct some interesting examples of algebraic weak factorisation systems (awfs's). Specifically, we will see how to construct awfs's that are cofibrantly generated with respect to a codomain fibration, as defined in a previous paper by the author." @default.
- W2788394322 created "2018-03-06" @default.
- W2788394322 creator A5055875276 @default.
- W2788394322 date "2018-02-21" @default.
- W2788394322 modified "2023-09-27" @default.
- W2788394322 title "W-Types with Reductions and the Small Object Argument" @default.
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