Syllogisms – Logic For Clear Thinkers

About Syllogisms

“I consider the invention of the form of syllogisms one of the most beautiful, and also one of the most important, made by the human mind.”

- Gottfried Leibniz

“Fallacious and misleading arguments are most easily detected if set out in correct syllogistic form.”

- Immanuel Kant

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Syllogisms are also part of the Ontario Police PATI test and the basis of questions for the LSAT test. Chances are that you are here because you must prepare for one of these tests.

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3 Comments

3 responses so far ↓

  • grace22 // September 18, 2009 at 10:45 am | Reply

    is this syllogism is valid??

    ”practice makes perfect
    but nobody is perfect
    so why practice…

    why do you say so??
    i need the answer as soon as possible..tnx

  • dari // November 16, 2009 at 1:32 am | Reply

    in response to the practice makes perfect question. i would say that its not a valid syllogism bc the conclusion”why practice” does not fit because the 1st line says practice makes perfect, but not practice ONLY makes perfect- i.e. the statement does not disclude other benefits of practice, such as “practice makes improvement. practice makes skill.” thus presenting the benefit of practice to be “perfection,” which is faulty, and then saying that perfection is unattainable, therefore practice is useless is incorrect logic because the first statement does not limit practice’s use it simply provides one supposed result of practice.

  • John // November 17, 2009 at 12:16 pm | Reply

    The closest you could have is:

    If one practices then one achieves perfection.

    One never achieves perfection.

    Therefore one never practices.

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