Null

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Null is the tag for the expression that represents nothing.

Although it seems useless, the Null expression is widely used, mainly while editing expressions

Definition

This expression must have no children.

Visualization

While the visual representation of the Null expression must denote a senseless element, it must also have appreciable dimensions, in order to be distinguished as a sub-expression of a given expression.

Edition

There should not be editions to create a Null expression, given its senseless nature.

However, Null expressions are commonly created by other editions.

Reduction

Since this expression is not expected to be reduced to a different one, no reducers are currently known.

Known implementations

Core Fōrmulæ library

The Null expression is the only expression that is implemented in the core Fōrmulæ library, instead of a package. So this implementation cannot be deleted or disabled.

Visualization

There is one visualizalization for the Null expression.

This visualization shows a square. The dimensions of this square is 10 x 10 pixels, as shown:

Null.png