Proof by Contradiction/Proof Rule/Technical Note

Technical Note on Proof by Contradiction

When invoking Proof by Contradiction in a tableau proof, use the {{Contradiction}} template:

{{Contradiction|line|pool|statement|start|end}}

where:

line is the number of the line on the tableau proof where the Proof by Contradiction is to be invoked

pool is the pool of assumptions (comma-separated list)

statement is the statement of logic that is to be displayed in the Formula column, without the $ ... $ delimiters

start is the start of the block of the tableau proof upon which this line directly depends

end is the end of the block of the tableau proof upon which this line directly depends