26 lines
727 B
Markdown
26 lines
727 B
Markdown
# log-e-sappho
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experimental type system implementation
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## sappho grammar
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```
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s, t ::= s | t (disjunction, a.k.a. union)
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| s & t (conjunction, a.k.a. intersection)
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| s => t (implication)
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| s -> t (arrow, a.k.a. function)
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| forall x . t (forall, polymorphic)
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| box t (box, modular logic)
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| a [t..] (type operator application)
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| x (variable)
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| n (nominal)
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| true (true, a.k.a. top)
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| false (false, a.k.a. bottom)
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| { m : t } (member, a.k.a. atomic record)
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x ∈ var
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n ∈ nominal
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a ∈ opname
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```
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