Question 910335
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1.  F &#8835; A
2.  (~F v B)&#8835; (A v D )
3.  ~ A • ~ B *[tex \LARGE \ \ ]| *[tex \LARGE \ \ ] D

4.  ~ A *[tex \LARGE \ \ \ \ \ \ \ \ \ \  ] from 3 by Simplification
5.  ~ F *[tex \LARGE \ \ \ \ \ \ \ \ \ \  ] from 4, 1 by Modus Tollens
6.  ~ F v B *[tex \LARGE \ \ \ \ \ \ ] from 5 by Addition
7.  A v D *[tex \LARGE \ \ \ \ \ \ \ ] from 6, 2 by Modus Ponens
8.  D   *[tex \LARGE \ \ \ \ \ \ \ \ \ \ \ ] from 7, 4 by Disjunctive Syllogism


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
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*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \