There's no difference. He used a notation based on relationships rather than functions.
That's unfortunate in my opinion. The usual semantics should be retained. -- FL -- You received this message because you are subscribed to the Google Groups "Metamath" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/metamath/4746e0aa-8b89-4689-b6f9-a9d7d58dc55d%40googlegroups.com.
