<PRE><B>Question 674749</B>
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(1)  *[tex \LARGE I\ \to\ \ \ S]  :  Given

(2)  *[tex \LARGE D\ \to\ \neg\ S]  : Given

(3)  *[tex \LARGE S\ \small\vee\LARGE\ \neg S]  :  Law of Excluded Middle

(4)  *[tex \LARGE S\ \to\ \neg\ D]   :  (2) Modus Tolens

(5)  *[tex \LARGE \neg\ S\ \to\ \neg\ I]  : (2) Modus Tolens

(6)  *[tex \LARGE \neg\ D\ \small\vee\LARGE\ \neg\ I] : (3) *[tex \LARGE \to] (4) or (5)


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John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
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My calculator said it, I believe it, that settles it
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