However Introduction to Arithmetic does contain quite elementary errors which show that Nicomachus chose not to give proofs of his results because he did not in general have such proofs.
Subalit Panimula sa Arithmetic ay naglalaman ng lubos elementarya error na ipakita na Nicomachus pinili hindi upang bigyan ng proofs ng kanyang mga resulta dahil siya ay hindi sa pangkalahatan ay may tulad ng proofs.