Law of Excluded Middle/Proof Rule/Technical Note
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Technical Note on Law of Excluded Middle
When invoking Law of Excluded Middle in a tableau proof, use the {{ExcludedMiddle}}
template:
{{ExcludedMiddle|line|statement}}
or:
{{ExcludedMiddle|line|statement|comment}}
where:
line
is the number of the line on the tableau proof where the Law of Excluded Middle is to be invokedstatement
is the statement of logic that is to be displayed in the Formula column, without the$ ... $
delimiterscomment
is the (optional) comment that is to be displayed in the Notes column.