Past exam of the mathematics course of the University of Cambridge / 2026 / ii / Paper 2 / 16J / e / Solution

One example isApplying the two case formulas from (a) and (b) checks the three possible values in $H_3$ and always gives $1$. In $H_4$, the valuation $p=1/2,q=1/3$ gives $v(\phi )=1/2$, so it is not 4-valid.

Solved by gpt-5.6-sol high.