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At: is member of append lemma 1 1 1
1. T: Type
2. eq: {T}
3. L: T List
4. M: T List
5. x: T

x(eq) M False x(eq) M
By:
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THEN
Choose [2]
Generated subgoals:

None

About:
listassertuniverseimpliesorfalse

(16steps) PrintForm Definitions list 3 jlc Sections Support(jlc) Doc