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		651 bytes added
	
		,  03:46, 17 December 2010
	
 
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|  | t ~\operatorname{is}~ P^{\prime}, P^{\prime\prime}, P^{\prime\prime\prime}, |  | t ~\operatorname{is}~ P^{\prime}, P^{\prime\prime}, P^{\prime\prime\prime}, | 
|  | \\[4pt] |  | \\[4pt] | 
| − | S^{\prime}, S^{\prime\prime}, S^{\prime\prime\prime} ~\operatorname{are}~ q, | + | S^{\prime}, S^{\prime\prime}, S^{\prime\prime\prime} ~\operatorname{are}~ q; | 
|  | \\[4pt] |  | \\[4pt] | 
|  | \therefore t ~\operatorname{is}~ q. |  | \therefore t ~\operatorname{is}~ q. | 
|  | \end{matrix}</math> |  | \end{matrix}</math> | 
|  | </center> |  | </center> | 
|  | + |  | 
|  | + | <p>Such an argument is double.  It combines the two following: | 
|  | + |  | 
|  | + | <center> | 
|  | + | <math>\begin{matrix} | 
|  | + | 1. | 
|  | + | \\[4pt] | 
|  | + | S^{\prime}, S^{\prime\prime}, S^{\prime\prime\prime} ~\operatorname{are~taken~as~being}~ P^{\prime}, P^{\prime\prime}, P^{\prime\prime\prime}, | 
|  | + | \\[4pt] | 
|  | + | S^{\prime}, S^{\prime\prime}, S^{\prime\prime\prime} ~\operatorname{are}~ q; | 
|  | + | \\[4pt] | 
|  | + | \therefore ~(\operatorname{By~induction})~ P^{\prime}, P^{\prime\prime}, P^{\prime\prime\prime} ~\operatorname{is}~ q, | 
|  | + | \\[4pt] | 
|  | + | t ~\operatorname{is}~ P^{\prime}, P^{\prime\prime}, P^{\prime\prime\prime}; | 
|  | + | \\[4pt] | 
|  | + | \therefore ~(\operatorname{Deductively})~ t ~\operatorname{is}~ q. | 
|  | + | \end{matrix}</math> | 
|  | + | </center> | 
|  | + |  | 
|  | |} |  | |} | 
|  |  |  |  |