File: sub_arrow.ott

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defns
Jtype :: '' ::= 

defn
G |- t : T :: :: typing :: T_ {{ com Typing }} by

G |- t:S
S<:T
---------- :: Sub
G |- t:T


defn
T1 <: T2 :: :: subtyping :: S_ {{ com Subtyping }} by

------ :: Refl
S <: S

S <: U
U <: T
------ :: Trans
S <: T

T1 <: S1
S2 <: T2
---------------- :: Arrow
S1->S2 <: T1->T2