mb event system 5 Sections EventSystems Doc
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Def EqDecider(T) == eq:TTx,y:Tx = y  (eq(x,y))

is mentioned by

Thm* eq:EqDecider(T), f,g,h:x:T fp-> Type.
Thm* f || g
Thm* 
Thm* h || f
Thm* 
Thm* h || g
Thm* 
Thm* g  h  f  g & f  h  f  g & h  g  h  f  g & h  f  h  f  g
[fpf-compatible-triple]
Thm* eq:EqDecider(A), P:(ATypeProp), f,g:x:A fp-> Type.
Thm* ydom(f). w=f(y  P(y,w)
Thm* 
Thm* ydom(g). w=g(y  P(y,w ydom(f  g). w=f  g(y  P(y,w)
[fpf-all-join-decl]
Thm* eq:EqDecider(A), B:(AType), f,g,h:a:A fp-> B(a).
Thm* f || h  g || h  f  g || h
[fpf-compatible-join2]
Thm* eq:EqDecider(A), B:(AType), f,g:a:A fp-> B(a). f || g  g || f[fpf-compatible-symmetry]
Thm* eq:EqDecider(A), B:(AType), f,g,h:a:A fp-> B(a).
Thm* h || f  h || g  h || f  g
[fpf-compatible-join]
Thm* B:(AType), x:Av:B(x), eqa:EqDecider(A). x : v  x : v[fpf-single-sub-reflexive]
Thm* B:(AType), eq:EqDecider(A), f,g:a:A fp-> B(a). f || g  g  f  g[fpf-sub-join-right]
Thm* B1,B2:(AType), eq:EqDecider(A), f:a:A fp-> B1(a), g:a:A fp-> B2(a).
Thm* f  f  g
[fpf-sub-join-left]
Thm* eq:EqDecider(A), f,g:a:A fp-> Top, x:Az:Top.
Thm* f  g(x)?z ~ if x  dom(f) f(x)?z else g(x)?z fi
[fpf-join-cap-sq]
Thm* B,C:(AType), eq:EqDecider(A), f:a:A fp-> B(a), g:a:A fp-> C(a), x:A.
Thm* x  dom(f f  g(x) = f(x B(x)
[fpf-join-ap-left]
Thm* B:(AType), eq:EqDecider(A), f,g:a:A fp-> B(a), x:A.
Thm* x  dom(f  g f  g(x) = if x  dom(f) f(x) else g(x) fi  B(x)
[fpf-join-ap]
Thm* A:Type, B:(AType), f,g:a:A fp-> B(a), eq:EqDecider(A).
Thm* f  g  a:A fp-> B(a)
[fpf-join_wf]
Thm* eq:EqDecider(X), f,g:x:X fp-> Type, x:Xf  g  (f(x)?Void g(x)?T)[subtype-fpf-cap-void]
Thm* eq:EqDecider(A), ds:x:A fp-> Type, x:Ads(x)?Void ds(x)?Top[fpf-cap-void-subtype]
Thm* eq:EqDecider(X), f,g:x:X fp-> Type, x:Xg  f  (f(x)?T g(x)?Top)[subtype-fpf-cap-top]
Thm* eq:EqDecider(X), f,g:x:X fp-> Type. g  f  (x:Xf(x)?Top g(x)?Top)[subtype-fpf-cap]
Thm* B:(AType), eq:EqDecider(A), f,g:a:A fp-> B(a). f = g  f  g[fpf-sub_weakening]
Thm* B:(AType), eq:EqDecider(A), f,g,h:a:A fp-> B(a). f  g  g  h  f  h[fpf-sub_transitivity]
Thm* strong-subtype(A;A')
Thm* 
Thm* (B:(AType), C:(A'Type), eq:EqDecider(A), eq':EqDecider(A'),
Thm* (f,g:a:A fp-> B(a). (a:AB(aC(a))  f  g  f  g)
[fpf-sub_functionality]
Thm* strong-subtype(A;A')
Thm* 
Thm* (B:(AType), C:(A'Type), eq:EqDecider(A), eq':EqDecider(A'),
Thm* (f,g:a:A fp-> B(a). (a:AB(aC(a))  f  g  f  g)
[fpf-sub-functionality]
Thm* A:Type, f:a:A fp-> Type, eq:EqDecider(A), x:Az:Type. f(x)?z  Type[fpf-cap-wf-univ]
Thm* A:Type, B:(AType), f:a:A fp-> B(a), eq:EqDecider(A), x:Az:B(x).
Thm* f(x)?z  B(x)
[fpf-cap_wf]
Thm* A:Type, B:(AType), f:a:A fp-> B(a), eq:EqDecider(A), x:A,
Thm* P:(a:{a:Aa  dom(f) }B(a)Prop). z != f(x) ==> P(x,z Prop
[fpf-val_wf]
Thm* eq:EqDecider(A), B:(AType), x,y:Av:B(x), u:B(y).
Thm* (x = y  v = u  B(x))  x : v || y : u
[fpf-compatible-singles]

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mb event system 5 Sections EventSystems Doc