∀ {𝕜 : Type u_12} {E : Type u_13} [inst : SeminormedRing 𝕜] [inst_1 : AddGroup E] [inst_2 : SMul 𝕜 E]
  [inst_3 : SizeOf 𝕜] [inst_4 : SizeOf E] (toAddGroupSeminorm : AddGroupSeminorm E)
  (smul' : ∀ (a : 𝕜) (x : E), toAddGroupSeminorm.toFun (a • x) = ‖a‖ * toAddGroupSeminorm.toFun x),
  sizeOf { toAddGroupSeminorm := toAddGroupSeminorm, smul' := smul' } = 1 + sizeOf toAddGroupSeminorm