M:MessageStruct. content(M) 
|M|
|cEQ(M)|A:Type, B:(AType), p:(a:A
B(a)). 2of(p) B(1of(p))A:Type, B:(AType), p:(a:AB(a)). 1of(p) A| Who Cites msg content? | |
| msg_content | Def content(MS) == 1of(2of(2of(MS))) |
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Thm* M:MessageStruct. content(M) |M||cEQ(M)| | |
| pi2 | Def 2of(t) == t.2 |
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Thm* A:Type, B:(AType), p:(a:AB(a)). 2of(p) B(1of(p)) | |
| pi1 | Def 1of(t) == t.1 |
| Thm* A:Type, B:(AType), p:(a:AB(a)). 1of(p) A |
| Syntax: | content(MS) | has structure: | msg_content(MS) |
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