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Homework 2_1

This is the task corresponding to homework 2 Bonus exercise 1.

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Definitions File 

theory Defs
  imports Main
begin


consts denc :: "int \<Rightarrow> int list \<Rightarrow> int list"

consts ddec :: "int \<Rightarrow> int list \<Rightarrow> int list"


end

Template File 

theory Submission
  imports Defs
begin

fun denc :: "int \<Rightarrow> int list \<Rightarrow> int list"  where
  "denc _ = undefined"

fun ddec :: "int \<Rightarrow> int list \<Rightarrow> int list"  where
  "ddec _ = undefined"

theorem denc_enc_id: "ddec 0 (denc 0 l) = l"
  sorry

end

Check File 

theory Check
  imports Submission
begin

theorem denc_enc_id: "ddec 0 (denc 0 l) = l"
  by (rule Submission.denc_enc_id)

end
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