Double Negation/Double Negation Introduction/Proof Rule/Technical Note

Proof Rule on Double Negation Introduction

When invoking Double Negation Introduction in a tableau proof, use the {{DoubleNegIntro}} template:

{{DoubleNegIntro|line|pool|statement|depends}}

or:

{{DoubleNegIntro|line|pool|statement|depends|comment}}

where:

line is the number of the line on the tableau proof where Double Negation Introduction 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

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

comment is the (optional) comment that is to be displayed in the Notes column.