
The complete proof:
The Isar proof is in: proofs/isar_proof5.thy
The proof in the natural language form is in: proofs/nl_proof5.tex
The number of steps: 30
The number of axioms used: 4
The list of used axioms:
ax_D1 ax_D6a ax_g4 ax_D5 

The clean proof: 
The Isar proof is in: proofs/isar_proof_optimized5.thy
The proof in the natural language form is in: proofs/nl_proof_optimized5.tex
The number of steps: 20

The list of all axioms considered (given and derived) is in: all_axioms.txt.

Basic time: 0.01 seconds. 
Cleaning time: 0.01 seconds. 
Total time: 0.02 seconds. 

