∀ {α : Type u_1} {ε : Type u_3} {m : MeasurableSpace α} [inst : TopologicalSpace ε] [inst_1 : ESeminormedAddMonoid ε]
  {p : ENNReal} {μ : MeasureTheory.Measure α} {f g : α → ε},
  MeasureTheory.AEStronglyMeasurable f μ →
    MeasureTheory.AEStronglyMeasurable g μ →
      1 ≤ p → MeasureTheory.eLpNorm (f + g) p μ ≤ MeasureTheory.eLpNorm f p μ + MeasureTheory.eLpNorm g p μ