Law of Excluded Middle/Proof Rule/Technical Note

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 invoked
statement is the statement of logic that is to be displayed in the Formula column, without the $ ... $ delimiters
comment is the (optional) comment that is to be displayed in the Notes column.
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