--- title: "Meaning & Key Takeaway of: Either A is B or C is D,” means, “if A is…" description: "\"“Either A is B or C is D,” means, “if A is not B, C is D; and if C is not D, A is B.” All hypothetical propositions, therefore, though disjunctive in f..." image: "https://sms4smile.com/quotes/i/de7/john-stuart-mill-477_conditional_either-a-is-b-or-c-is-d-means-if-a-is-no_703750.png" --- # Either A is B or C is D,” means, “if A is not B, C is D… ![“Either A is B or C is D,” means, “if A is not B, C is D; and if C is not D, A is B.” All hypothetical propositions, therefore, though disjunctive in form, are conditional in meaning; and the words hypothetical and conditional may be, as indeed they generally are, used synonymously.” quote by John Stuart Mill](https://sms4smile.com/quotes/i/de7/john-stuart-mill-477_conditional_either-a-is-b-or-c-is-d-means-if-a-is-no_703750.png) [Download](https://sms4smile.com/quotes/i/de7/john-stuart-mill-477_conditional_either-a-is-b-or-c-is-d-means-if-a-is-no_703750.png) [Open image](https://sms4smile.com/quotes/i/de7/john-stuart-mill-477_conditional_either-a-is-b-or-c-is-d-means-if-a-is-no_703750.png) > ““Either A is B or C is D,” means, “if A is not B, C is D; and if C is not D, A is B.” All hypothetical propositions, therefore, though disjunctive in form, are conditional in meaning; and the words hypothetical and conditional may be, as indeed they generally are, used synonymously.”” [John Stuart Mill](https://sms4smile.com/quotes/author/john-stuart-mill/) ## About This Quote This interpretation was drafted with AI assistance. It is one reading of the quote, not the author's own explanation. Logical equivalence shows that certain disjunctive statements function as conditionals, meaning the terms “hypothetical” and “conditional” can be used interchangeably. **In simple terms:** Some “or” statements act like “if‑then” statements. Key Takeaway Recognize hidden conditional logic. Themes logic philosophy language semantics reasoning Mood analytical thoughtful Type philosophical educational When to use this quote - academic writing - debate - critical thinking Key Concepts deductive reasoning formal logic argument analysis Questions to Reflect On - When do you treat “or” as a conditional? - What are the risks of conflating terms? 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