| | Who Cites Msg sub? |
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| Msg_sub | Def Msg_sub(l; M) == {m:Msg(M)| haslink(l; m) } |
| | | Thm* M:(IdLnk Id Type), l:IdLnk. Msg_sub(l; M) Type |
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| haslink | Def haslink(l; m) == mlnk(m) = l |
| | | Thm* M:(IdLnk Id Type), l:IdLnk, m:Msg(M). haslink(l; m) Prop |
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| Msg | Def Msg(M) == l:IdLnk t:Id M(l,t) |
| | | Thm* M:(IdLnk Id Type). Msg(M) Type |
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| mlnk | Def mlnk(m) == 1of(m) |
| | | Thm* M:(IdLnk Id Type), m:Msg(M). mlnk(m) IdLnk |
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| IdLnk | Def IdLnk == Id Id  |
| | | Thm* IdLnk Type |
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| Id | Def Id == Atom  |
| | | Thm* Id Type |
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| pi1 | Def 1of(t) == t.1 |
| | | Thm* A:Type, B:(A Type), p:(a:A B(a)). 1of(p) A |
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| nat | Def == {i: | 0 i } |
| | | Thm* Type |
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| le | Def A B == B<A |
| | | Thm* i,j: . (i j) Prop |
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| not | Def A == A  False |
| | | Thm* A:Prop. ( A) Prop |