∀ {M : Type u_1} [inst : AddMonoid M] [inst_1 : MeasurableSpace M] [MeasurableAdd₂ M] {μ ν : MeasureTheory.Measure M}
  {f : M → ENNReal}, Measurable f → ∫⁻ (z : M), f z ∂μ.conv ν = ∫⁻ (z : M × M), f (z.1 + z.2) ∂μ.prod ν