XNOR

By adding another function bit to bitwise negate A as well, we can include all possible (non-identity) bitwise operations (NOT, AND, OR, NAND, NOR, XOR, XNOR).

Babbage-Boole Digital Arithmetical and Logical Mill: Part 1 « The Half-Baked Maker

Applying a set of rules to the combination of bits at a given pixel (in the case of this Demonstration, XNOR) reveals the message, which might look like this:

Wolfram Blog : 2008 : June

Applying a set of rules to the combination of bits at a given pixel (in the case of this Demonstration, XNOR) reveals the message, which might look like this:

Wolfram Blog : Secret Codes in The Wolfram Demonstrations Project (But No Dinosaurs)

When using NOR, XNOR takes four NORs and XOR takes five.

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Here the exclusive nor (XNOR) returns "true" if input a1 and a2 are identical, and returns "false" if they are different.

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If the grouping of (a1 XNOR a2) returns true, the search can stop.

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Here the exclusive nor (XNOR) returns "true" if input a1 and a2 are identical, and returns "false" if they are different.

PLoS ONE Alerts: New Articles