FalseQ

Determines if an expression is explicitly false, or not

ResourceFunction["FalseQ"][expr]

yields True if expr is False, and yields False otherwise.

Details and Options

ResourceFunction["FalseQ"][expr] is equivalent to If[expr,False,True,False].

Examples

Basic Examples

FalseQ will return True only if the input is explicitly False:

In[1]:=

$ResourceFunction[ "https://www.wolframcloud.com/obj/arnoudb/DeployedResources/Function/\ FalseQ"][False]$

Out[1]=

In[2]:=

$ResourceFunction[ "https://www.wolframcloud.com/obj/arnoudb/DeployedResources/Function/\ FalseQ"][True]$

Out[2]=

In[3]:=

$ResourceFunction[ "https://www.wolframcloud.com/obj/arnoudb/DeployedResources/Function/\ FalseQ"][x]$

Out[3]=

Properties and Relations

The relationship between TrueQ and FalseQ:

In[4]:=

$Table[{expr, TrueQ[expr], ResourceFunction[ "https://www.wolframcloud.com/obj/arnoudb/DeployedResources/\ Function/FalseQ"][expr]}, {expr, {True, False, x}}] // Grid[#, Frame -> All] &$

Out[4]=