Proof by Contradiction/Proof Rule/Technical Note

Technical Note on
When invoking  in a tableau proof, use the Contradiction template:



where:
 * is the number of the line on the tableau proof where the is to be invoked
 * is the pool of assumptions (comma-separated list)
 * is the statement of logic that is to be displayed in the Formula column, without the  delimiters
 * is the start of the block of the tableau proof upon which this line directly depends
 * is the end of the block of the tableau proof upon which this line directly depends