claimroutine

Equal-endpoint collisions contribute o(S)

Claim·§5.2 Three fixed pair experiments·inside propUpper score budget for pair experiments

Statement (paper)

The contribution to DiD_i of pairs with equal endpoints, to which the product formula was not applied, is o(S)o(S) for each i∈{Q,P,Pθ}i\in\{Q,P,P\theta\}. Precisely, it is at most 2dQ,min⁡(Wc+EκHq∗)\frac{2}{d_{Q,\min}}(W_c+\E_\kappa H_q^*), 2dP,min⁡(Wc+EμHp∗)\frac{2}{d_{P,\min}}(W_c+\E_\mu H_p^*), and 2MdP,min⁡(Wc+EμHp∗)\frac{2M}{d_{P,\min}}(W_c+\E_\mu H_p^*) respectively, and each of these bounds is o(S)o(S).

In plain English

The part of DiD_i coming from pairs with equal endpoints, where the product formula was not applied, is at most 2dQ,min⁡(Wc+EκHq∗)\frac{2}{d_{Q,\min}}(W_c+\E_\kappa H_q^*) for QQ, 2dP,min⁡(Wc+EμHp∗)\frac{2}{d_{P,\min}}(W_c+\E_\mu H_p^*) for PP, and 2MdP,min⁡(Wc+EμHp∗)\frac{2M}{d_{P,\min}}(W_c+\E_\mu H_p^*) for PθP\theta. Each of these bounds is o(S)o(S).

Why it's here

This disposes of the pairs the product formula cannot handle, so the bound on DiD_i only needs the product-formula part, which gives the 10δ2λCi10\delta^2\lambda C_i term. The collision probability is bounded using the uniform edge marginals and the M/d(p)M/d(p) collision bound of the pair-laws lemma. The first-moment bound EμHp∗+EκHq∗=O(S)\E_\mu H_p^*+\E_\kappa H_q^*=O(S) from the rare-exceptions lemma, together with dQ,min⁡−1=o(1)d_{Q,\min}^{-1}=o(1) from the parameter choice, makes the bounds o(S)o(S).
Classified routine:
A bookkeeping step inside the upper-budget proof. It combines the collision bound from the pair-laws lemma, the first-moment bound E H^* = O(S) from the rare-exceptions lemma, and d_{Q,min}^{-1} = o(1) from the parameter choice.

Sources

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§5.2 Three fixed pair experiments
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sections/04-budgets.tex:380
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