Armstrong's argument in 'Universals and Scientific Realism' demonstrates that any nomological explanation of the form 'a is F because all Gs are F' presupposes a real connection between the properties G and F.

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Armstrong: # Armstrong Armstrong most commonly refers to **Neil Armstrong** (1930-2012), an American astronaut and aeronautical engineer who became the first human to walk on the Moon on July 20, 1969. He is remembered as a pioneering explorer whose famous words—"That's one small step for man, one giant leap for mankind"—marked humanity's first footsteps on another celestial body. Armstrong's achievement remains one of the most significant moments in human history and symbolizes the height of space exploration and scientific achievement.
Nomological explanation(as used in philosophy of science): An explanation based on natural laws—answering 'why' something happened by pointing to the fundamental rules that govern how the world works.
Presupposes(as describing what Plantinga's argument takes for granted): Assumes something to be true without proving it—like how an argument might presuppose that logic works, without first arguing that logic is valid.
Real connection between properties(what Armstrong claims must exist for his theory to work)

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