### AMS Without 4-Wise Independence on Product Domains

Vladimir Braverman, Kai-Min Chung, Zhenming Liu, Michael Mitzenmacher & Rafail Ostrovsky
In their seminal work, Alon, Matias, and Szegedy introduced several sketching techniques, including showing that $4$-wise independence is sufficient to obtain good approximations of the second frequency moment. In this work, we show that their sketching technique can be extended to product domains $[n]^k$ by using the product of $4$-wise independent functions on $[n]$. Our work extends that of Indyk and McGregor, who showed the result for $k = 2$. Their primary motivation was the...
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