module 0Trinitarianism.Quest3 where

open import 0Trinitarianism.Preambles.P3

_+_ : ℕ → ℕ → ℕ
n + m = {!!}

SumOfEven : (x : Σ ℕ isEven) → (y : Σ ℕ isEven) → isEven (x .fst + y .fst)
SumOfEven x y = {!!}