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First try of proving for fun

First try of proving for fun

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Download Files

Definitions File

theory Defs
imports Main 
begin

end

Template File

theory Submission
imports Defs
begin

lemma goal1: "(A \<and> (B \<or> C)) = ((A \<and> B) \<or> (A \<and> C))"
  sorry

lemma goal2: "length (append x y)= (length x) + (length y)"
  sorry

end

Check File

theory Check
imports Submission
begin

lemma "(A \<and> (B \<or> C)) = ((A \<and> B) \<or> (A \<and> C))" by (rule goal1)

lemma "length (append x y)= (length x) + (length y)"  by (rule goal2)

end

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