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The quadrix is equal to 9,999. The term was coined by André Joyce.[1]

As it is the largest four-digit number in decimal, it has been used in carnahan.c, chan-3.c and pete-6.c.[2]

## Etymology

The 2 parts of the name, “quadr” and “ix”, mean 4 and 9, respectively.

## Approximations

Notation Lower bound Upper bound
Scientific notation $$9.999\times10^3$$
Arrow notation $$99\uparrow2$$ $$10\uparrow4$$
Steinhaus-Moser Notation 5[3] 6[3]
Copy notation 9[4]
Chained arrow notation $$99\rightarrow2$$ $$10\rightarrow4$$
Taro's multivariable Ackermann function A(3,10) A(3,11)
Pound-Star Notation #*(70)*2 #*(71)*2
PlantStar's Debut Notation [2] [3]
BEAF {99,2} {10,4}
Hyper-E notation 99E2 E4
Bashicu matrix system (0)[99] (0)[100]
Hyperfactorial array notation 7! 8!
Bird's array notation {99,2} {10,4}
Strong array notation s(99,2) s(10,4)
Fast-growing hierarchy $$f_1(f_2(9))$$ $$f_2(10)$$
Hardy hierarchy $$H_{\omega^2+\omega}(9)$$ $$H_{\omega^2}(10)$$
Slow-growing hierarchy $$g_{\omega^2}(99)$$ $$g_{\omega^4}(10)$$

## Sources

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