Commit 29c117af authored by Dan Frumin's avatar Dan Frumin

clarify that modalities can be heterogeneous

parent 94ced2c9
......@@ -7,9 +7,9 @@ Import bi.
instantiated with a variety of modalities.
For the purpose of MoSeL, a modality is a mapping of propositions
`M : PROP → PROP` (where `PROP` is a type of bi-assertions) that is
monotone and distributes over finite products. Specifically, the following
rules have to be satisfied.
`M : PROP1 → PROP2` (where `PROP1` and `PROP2` are BI-algebras)
that is monotone and distributes over finite products. Specifically,
the following rules have to be satisfied:
P ⊢ Q emp ⊢ M emp
----------
......
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