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by andrewflnr 3357 days ago
(Life on enceladus -> Life is common) does not entail (No life on enceladus -> Life is rare) by any length of proof, much less one short enough to let you call it a "corollary" with a straight face. This would be so even if "Life is common" and "Life is rare" were perfect logical complements, rather than being endpoints on a wide spectrum.