<PRE><B>Question 790154</B>
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p | q | r | ~q | ~r | q v r | p =&gt; (q v r) | p ^ ~r

T   T   T   F    F      T        T             F
T   T   F   &lt;u&gt;F&lt;/u&gt;    T      T        &lt;u&gt;T&lt;/u&gt;             &lt;u&gt;T&lt;/u&gt;
T   F   T   T    F      T        T             F
T   F   F   T    T      F        F             T
F   T   T   F    F      T        T             F
F   T   F   F    T      T        T             F
F   F   T   T    F      T        T             F
F   F   F   T    T      F        T             F

Where p =&gt; (q v r) and p ^ ~r are both true, ~q is false.  Invalid argument.
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John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
&lt;font face=&quot;Math1&quot; size=&quot;+2&quot;&gt;Egw to Beta kai to Sigma&lt;/font&gt;
My calculator said it, I believe it, that settles it
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