At that time Jan Lukasiewicz was teaching at Lwów, being promoted from Privatdozent to extraordinary professor in 1911, and he greatly influenced Lesniewski in the first course on mathematical logic which he gave there.
Sa panahon na Jan Lukasiewicz ay pagtuturo sa Lwów, itinataguyod mula sa Privatdozent sa kagila-gilalas propesor sa 1911, siya at malaki naiimpluwensyahan Lesniewski sa unang kurso sa matematika na lohika na ibinigay niya doon.