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Hypothetical Syllogism

Hypothetical Syllogism. Hypothetical syllogism. -a deductive argument which asserts the sequential relation between the two elements of a hypothetical proposition -its main premise is a hypothetical proposition. Analysis of a hypothetical prop. If it rains, then the roof is wet.

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Hypothetical Syllogism

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  1. Hypothetical Syllogism

  2. Hypothetical syllogism -a deductive argument which asserts the sequential relation between the two elements of a hypothetical proposition -its main premise is a hypothetical proposition

  3. Analysis of a hypothetical prop. If it rains, then the roof is wet C-consequent A-antecedent + A + C + C ? A - C - A - A ? C

  4. Example If public officials committed serious lapses, then they will be charged administratively. Some police officers committed serious lapses. Hence, they will be charged administratively. +A Valid +C

  5. - C Valid Joe will not comeback unless he loves Michelle Joe will come back Ergo, he loves Michelle If you truly love a person, you don’t stifle her growth. Mickey lets go of Minnie to give her space for growth. Thus, Mickey truly loves Minnie - A Invalid +C + A

  6. Types of Hypothetical Syll. Conditional Simple Conditional If… then… Unless… Reciprocal Conditional Only if C, A

  7. Types of Hypothetical Syll. Conditional Biconditional If and only if… Pure conditional If B, then C If A, then B Ergo, if A, then C.

  8. Reciprocal conditional Only if students are treated as mature persons will they act responsibly But students are treated as mature persons. Hence, they will act responsibly. +C Invalid + A

  9. Biconditional If and only if Perf is a millionaire will Cath marry him Perf is not a millionaire Hence, Cath will not marry him. -A Valid - C - A - C + C + A - C - A +A +C

  10. Pure conditional • If A is B, then X is Y. • If X is Y, then C is D. • Ergo, if A is B, then C is D. • Rule: • The common element must be used once as antecedent and consequent. • If Nolan is honest, then he will tell the truth. If he will tell the truth, then he will implicate the officials behind illegal gambling. • Thus, if Nolan is honest, then he will implicate the officials behind illegal gambling. _________ Common Element _________

  11. Pure conditional • If the president is sincere in stopping corruptions, she will investigate the COMELEC. • If she will investigate the COMELEC, she will discover the anomalous transactions on election automation. • Hence, if the president is sincere in stopping corruptions, she will discover the anomalous transactions on election automation. • If Filipinos live a truly Christian life, then they will take care of their environment. If Filipinos show true concerns for the environment, then they will take care of their environment. Thus, if Filipinos show true concerns for the environment, then they live a truly Christian life.

  12. Disjunctive Syllogism • -a type of hypothetical syllogism whose main premise is a disjunctive proposition (Either… or…) • Types of Disjunctive • Perfect Disjunctive • -the main premise contains alternatives that cannot be both affirmed and denied. • Either he is telling the truth or he is telling a lie. ________________ _____________ +B - A • B • +A +A -B - A +B

  13. Perfect Disjunctive • Matt is either a theist or an non-theist. • He is not a non-theist. • Therefore, he is a theist. • Jie’s necklace is either rare or common. • Jie says it is rare. • Hence, it is not common • B • + A Valid + A - B Valid

  14. Disjunctive Syllogism • Types of Disjunctive • Imperfect Disjunctive • -the main premise contains alternatives that cannot be both denied but can be both affirmed • Either you try or you won’t succeed. _______ ______________ +A ?B +B ? A - A +B - B +A

  15. Imperfect Disjunctive • Jeff will either return to Malaysia or go to Singapore. • He is not going to Singapore. • So, he will return to Malaysia • Either he will engage in business or he will continue being an employee. • Georg will engage in business. • So, he will not continue being an employee. • B • + A Valid + A - B Invalid

  16. Conjunctive Syllogism • -a type of hypothetical syllogism whose main premise is a conjunctive proposition (cannot be both… and…) • -the main premise contains alternatives that cannot be both affirmed but can be both denied. • Pierre cannot be both in Albay and in Alcoy atst. ______ ________ • A • ?B +A -B +B - A • B • ?A

  17. Conjunctive Syllogism • Fred cannot both be a civil servant and a private businessman at the same time. • He is not a civil servant at this time • So, he is a private businessman. • No government prosecutor can both vigorously do his job and receive bribe at the same time. • Some state prosecutors are not doing their jobs vigorously. • Thus, they are receiving bribes. • A • + B Invalid - A + B Invalid

  18. The accused is either innocent or guilty. • Guevarra claims he is innocent. • Hence, he is guilty. • Either the president will not support population control program or Church groups will criticize him. • Many pro-Life Church groups are criticizing the president. • So, he is supporting population control. • One cannot be both a Muslim and Christian altogether. • Derek is not a Muslim. • So, he is a Christian. + A - B Valid Perfect Disjunctive Imperfect Disjunctive + A -B Invalid Conjunctive Invalid -A +B

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