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並前往https://milnepublishing.geneseo.edu/concise-introduction-to-logic/chapter/2-ifthen-and-it-is-not-the-case-that/

2. “If…then….” and “It is not the case that….”

Thus, it would be useful if our logical language was able to express these ... An oddity of English is that the word “only” changes the meaning of “if”.

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