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S4
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S4

logical system
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Learn about this topic in these articles:

  • Alfred North Whitehead
    formal logic
    / Alternative systems of modal logic

    … to T is known as S4; that obtained by adding Mp βŠƒ LMp to T is known as S5; and the addition of p βŠƒ LMp to T gives the Brouwerian system (named for the Dutch mathematician L.E.J. Brouwer), here called B for short.

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    … to T is known as S4; that obtained by adding Mp βŠƒ LMp to T is known as S5; and the addition of p βŠƒ LMp to T gives the Brouwerian system (named for the Dutch mathematician L.E.J. Brouwer), here called B for short.

    Read More