Counting lemma for octahedrally quasirandom three-uniform hypergraphs ($|t_F-{\prod }_e{p}_e|\le |E(F)|{\alpha }^{1/8}$)

Let a fixed simple three-uniform hypergraph $F$ have $m$ hypergraph edges, with one host vertex of a hypergraph class $V_i$ for each vertex of a hypergraph. Assume each hypergraph edge triple has indicator $h_e$, subset density $p_e$, and balanced three-dimensional box norm at most ${\alpha }^{1/8}$. The normalized labelled hypergraph copy count is $\mathbb{E}{\prod }_{e\in E(F)}{h}_e$. Telescope this product against ${\prod }_e{p}_e$. In each error term, fix all variables outside the three vertices of a hypergraph of its balanced hypergraph edge. Every other hypergraph edge intersects that triple in at most two vertices of a hypergraph, so the remaining factors group into three pair functions bounded by one. The pair-factor correlation bound for the three-dimensional box norm bounds the error by ${\alpha }^{1/8}$. Summing givesFor the three-uniform tetrahedron, $m=4$. The same argument with a common host set counts homomorphisms; excluding collisions of distinct abstract vertices of a hypergraph changes the count by at most $\left(\genfrac{}{}{0ex}{}{|V(F)|}{2}\right)|V{|}^{|V(F)|-1}$.