Σ⊢=

|𝕂| = 300 |𝕂×| = 16 |𝔾| = 1064 ✓ …

⊢

Σ · ≺ · ℓ
Σ = { 0 1 2 3 4 5 6 7 8 9 + = }
≺ : 0 ≺ 1 ≺ 2 ≺ 3 ≺ 4 ≺ 5 ≺ 6 ≺ 7 ≺ 8 ≺ 9 ≺ + ≺ =
N ::= 0 | [1-9][0-9]*
T ::= N | T + N
E ::= T = T
⊨ E  ⟺  ⟦T₁⟧ = ⟦T₂⟧
ℓ ≤ 6   ·   𝕂 = { E ∈ Σ* | ⊨ E }   ·   ⇅ (ℓ, ≺)

𝕂× = { a×b=c | a, b ∈ {0 1 2 3}, ⊨ }

Σ𝔾 = { 0 1 2 3 n + × ( ) = ∀ : }
≺ : 0 ≺ 1 ≺ 2 ≺ 3 ≺ n ≺ + ≺ × ≺ ( ≺ ) ≺ =
P ::= 0 | 1 | 2 | 3 | n | ( P + P ) | ( P × P )
G ::= ∀n: P = P
⊨ ∀n: P₁=P₂  ⟺  ∀k ∈ ℕ: ⟦P₁⟧(k) = ⟦P₂⟧(k)
𝔾 = { ∀n: P₀=P | ⊨, P ≉ P₀, |P| ≤ 9 }   ·   ∀P ∈ [P₀]: P₀ ≼ P

𝕂

300

𝕂×

16

𝔾

1064⊨ ✓ …