The example in Figure 1 should help understand why... the NL version is much more approachable for humans.

If its ambiguous or wrong, then what are you understanding ?

	▲	upboundspiral 4 hours ago \| parent [-]
		Is not a natural language (NL) proof a demonstration of mastery and understanding? If you understand the Lean, then you can create a NL proof. The LLM clearly doesn't understand the Lean code it produced.