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type-system.md

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@@ -70,7 +70,7 @@ However, in standard subtyping relations, the parametric version is the subtype.
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This is because `x -> x` can become a `A -> A`, but `A -> A` cannot become a `x -> x`.
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So something needs to change.
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The core problem here, is that specialization asks for covariance in the argument type, not contravariance like usual.
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The core problem here is that specialization asks for covariance in the argument type, not contravariance like usual.
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The reason for this is linguistic, not mathematical.
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When we say `f(x)` is a "function application with specialization", we mean that `f is informed by x`.
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We do not mean simply `f of x`.

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