**Chris Bird** is an English mathematician who helped develop and investigate Jonathan Bowers' BEAF, and created a parallel notation called Bird's array notation. His extensions to Array Notation, outlined in his 75-page paper *Array Notations for Super-Huge Numbers*,^{[1]} led to the development of the modern Exploding Array Function. He also proved that Array Notation with 5 or more entries grows much faster than Chained Arrow Notation.^{[2]}

Bird developed his own hierarchy of array notations and extended it up to the Bachmann-Howard ordinal.^{[3]} He later developed a newer version of his notation that he claimed was able to reach \(\psi_0(\Omega_{\omega})\).^{[4]} In 2014, he extended his notation yet again, this time reaching \(\vartheta(\Omega_\Omega)\).

Bird has a master's degree in mathematics, and has stated that he has Asperger's syndrome (an autism spectrum disorder).

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## See alsoEdit

- Bird's number
- Chris Bird's Super Huge Numbers (contains links to most recent versions of his papers)
- Bird's array notation