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The tetrakulus is equal to $$4\&4\&4\&4 = \{ 4,4 /2 \}$$ using the array of operator and BEAF.[1] It has possible interpretation of tetrakulus entries. The term was coined by Cookie Fonster. The number is derived from triakulus and the Greek word "tetra" for four.

Approximations in other notations Edit

Notation Approximation
Bird's array notation $$\{4,4 [1 [1 [2 \neg 3 \text{♦} 2] 2] 2] 2\}$$

Sources Edit

1. Template:Citation/CS1