How did lex luthor s rivalry with superman begin in original comics?

The only verified entity in the provided evidence is Superman, an iconic superhero from the DC Comics universe. There is no documented source in the supplied evidence that details Lex Luthor’s origins as an adversary, his motivations, or any initial conflict with Superman. Consequently, I cannot provide a historical account of their rivalry’s inception. While the broader DC canon does feature Lex Luthor as a recurring foe, that information is not supported by the given evidence and must remain outside this response. Therefore, the starting point of their rivalry cannot be confirmed based on the available data.