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Description: Addition is commutative for integers. Proven without ax-mulcom . (Contributed by SN, 25-Jan-2025)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | zaddcom | ⊢ ( ( 𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ ) → ( 𝐴 + 𝐵 ) = ( 𝐵 + 𝐴 ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | reelznn0nn | ⊢ ( 𝐴 ∈ ℤ ↔ ( 𝐴 ∈ ℕ0 ∨ ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ) ) | |
| 2 | reelznn0nn | ⊢ ( 𝐵 ∈ ℤ ↔ ( 𝐵 ∈ ℕ0 ∨ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) ) | |
| 3 | nn0addcom | ⊢ ( ( 𝐴 ∈ ℕ0 ∧ 𝐵 ∈ ℕ0 ) → ( 𝐴 + 𝐵 ) = ( 𝐵 + 𝐴 ) ) | |
| 4 | zaddcomlem | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ 𝐵 ∈ ℕ0 ) → ( 𝐴 + 𝐵 ) = ( 𝐵 + 𝐴 ) ) | |
| 5 | zaddcomlem | ⊢ ( ( ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ∧ 𝐴 ∈ ℕ0 ) → ( 𝐵 + 𝐴 ) = ( 𝐴 + 𝐵 ) ) | |
| 6 | 5 | eqcomd | ⊢ ( ( ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ∧ 𝐴 ∈ ℕ0 ) → ( 𝐴 + 𝐵 ) = ( 𝐵 + 𝐴 ) ) |
| 7 | 6 | ancoms | ⊢ ( ( 𝐴 ∈ ℕ0 ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( 𝐴 + 𝐵 ) = ( 𝐵 + 𝐴 ) ) |
| 8 | renegid2 | ⊢ ( 𝐵 ∈ ℝ → ( ( 0 −ℝ 𝐵 ) + 𝐵 ) = 0 ) | |
| 9 | 8 | ad2antrl | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( ( 0 −ℝ 𝐵 ) + 𝐵 ) = 0 ) |
| 10 | renegid2 | ⊢ ( 𝐴 ∈ ℝ → ( ( 0 −ℝ 𝐴 ) + 𝐴 ) = 0 ) | |
| 11 | 10 | ad2antrr | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( ( 0 −ℝ 𝐴 ) + 𝐴 ) = 0 ) |
| 12 | 11 | oveq1d | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( ( ( 0 −ℝ 𝐴 ) + 𝐴 ) + 𝐵 ) = ( 0 + 𝐵 ) ) |
| 13 | simplr | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( 0 −ℝ 𝐴 ) ∈ ℕ ) | |
| 14 | 13 | nncnd | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( 0 −ℝ 𝐴 ) ∈ ℂ ) |
| 15 | simpll | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → 𝐴 ∈ ℝ ) | |
| 16 | 15 | recnd | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → 𝐴 ∈ ℂ ) |
| 17 | simprl | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → 𝐵 ∈ ℝ ) | |
| 18 | 17 | recnd | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → 𝐵 ∈ ℂ ) |
| 19 | 14 16 18 | addassd | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( ( ( 0 −ℝ 𝐴 ) + 𝐴 ) + 𝐵 ) = ( ( 0 −ℝ 𝐴 ) + ( 𝐴 + 𝐵 ) ) ) |
| 20 | readdlid | ⊢ ( 𝐵 ∈ ℝ → ( 0 + 𝐵 ) = 𝐵 ) | |
| 21 | 20 | ad2antrl | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( 0 + 𝐵 ) = 𝐵 ) |
| 22 | 12 19 21 | 3eqtr3d | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( ( 0 −ℝ 𝐴 ) + ( 𝐴 + 𝐵 ) ) = 𝐵 ) |
| 23 | 22 | oveq2d | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( ( 0 −ℝ 𝐵 ) + ( ( 0 −ℝ 𝐴 ) + ( 𝐴 + 𝐵 ) ) ) = ( ( 0 −ℝ 𝐵 ) + 𝐵 ) ) |
| 24 | 9 23 11 | 3eqtr4d | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( ( 0 −ℝ 𝐵 ) + ( ( 0 −ℝ 𝐴 ) + ( 𝐴 + 𝐵 ) ) ) = ( ( 0 −ℝ 𝐴 ) + 𝐴 ) ) |
| 25 | simprr | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( 0 −ℝ 𝐵 ) ∈ ℕ ) | |
| 26 | 25 | nncnd | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( 0 −ℝ 𝐵 ) ∈ ℂ ) |
| 27 | 16 18 | addcld | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( 𝐴 + 𝐵 ) ∈ ℂ ) |
| 28 | 26 14 27 | addassd | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( ( ( 0 −ℝ 𝐵 ) + ( 0 −ℝ 𝐴 ) ) + ( 𝐴 + 𝐵 ) ) = ( ( 0 −ℝ 𝐵 ) + ( ( 0 −ℝ 𝐴 ) + ( 𝐴 + 𝐵 ) ) ) ) |
| 29 | 9 | oveq1d | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( ( ( 0 −ℝ 𝐵 ) + 𝐵 ) + 𝐴 ) = ( 0 + 𝐴 ) ) |
| 30 | 26 18 16 | addassd | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( ( ( 0 −ℝ 𝐵 ) + 𝐵 ) + 𝐴 ) = ( ( 0 −ℝ 𝐵 ) + ( 𝐵 + 𝐴 ) ) ) |
| 31 | readdlid | ⊢ ( 𝐴 ∈ ℝ → ( 0 + 𝐴 ) = 𝐴 ) | |
| 32 | 31 | ad2antrr | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( 0 + 𝐴 ) = 𝐴 ) |
| 33 | 29 30 32 | 3eqtr3d | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( ( 0 −ℝ 𝐵 ) + ( 𝐵 + 𝐴 ) ) = 𝐴 ) |
| 34 | 33 | oveq2d | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( ( 0 −ℝ 𝐴 ) + ( ( 0 −ℝ 𝐵 ) + ( 𝐵 + 𝐴 ) ) ) = ( ( 0 −ℝ 𝐴 ) + 𝐴 ) ) |
| 35 | 24 28 34 | 3eqtr4d | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( ( ( 0 −ℝ 𝐵 ) + ( 0 −ℝ 𝐴 ) ) + ( 𝐴 + 𝐵 ) ) = ( ( 0 −ℝ 𝐴 ) + ( ( 0 −ℝ 𝐵 ) + ( 𝐵 + 𝐴 ) ) ) ) |
| 36 | nnaddcom | ⊢ ( ( ( 0 −ℝ 𝐴 ) ∈ ℕ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) → ( ( 0 −ℝ 𝐴 ) + ( 0 −ℝ 𝐵 ) ) = ( ( 0 −ℝ 𝐵 ) + ( 0 −ℝ 𝐴 ) ) ) | |
| 37 | 36 | ad2ant2l | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( ( 0 −ℝ 𝐴 ) + ( 0 −ℝ 𝐵 ) ) = ( ( 0 −ℝ 𝐵 ) + ( 0 −ℝ 𝐴 ) ) ) |
| 38 | 37 | oveq1d | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( ( ( 0 −ℝ 𝐴 ) + ( 0 −ℝ 𝐵 ) ) + ( 𝐴 + 𝐵 ) ) = ( ( ( 0 −ℝ 𝐵 ) + ( 0 −ℝ 𝐴 ) ) + ( 𝐴 + 𝐵 ) ) ) |
| 39 | 18 16 | addcld | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( 𝐵 + 𝐴 ) ∈ ℂ ) |
| 40 | 14 26 39 | addassd | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( ( ( 0 −ℝ 𝐴 ) + ( 0 −ℝ 𝐵 ) ) + ( 𝐵 + 𝐴 ) ) = ( ( 0 −ℝ 𝐴 ) + ( ( 0 −ℝ 𝐵 ) + ( 𝐵 + 𝐴 ) ) ) ) |
| 41 | 35 38 40 | 3eqtr4d | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( ( ( 0 −ℝ 𝐴 ) + ( 0 −ℝ 𝐵 ) ) + ( 𝐴 + 𝐵 ) ) = ( ( ( 0 −ℝ 𝐴 ) + ( 0 −ℝ 𝐵 ) ) + ( 𝐵 + 𝐴 ) ) ) |
| 42 | 13 25 | nnaddcld | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( ( 0 −ℝ 𝐴 ) + ( 0 −ℝ 𝐵 ) ) ∈ ℕ ) |
| 43 | 42 | nncnd | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( ( 0 −ℝ 𝐴 ) + ( 0 −ℝ 𝐵 ) ) ∈ ℂ ) |
| 44 | 43 27 39 | sn-addcand | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( ( ( ( 0 −ℝ 𝐴 ) + ( 0 −ℝ 𝐵 ) ) + ( 𝐴 + 𝐵 ) ) = ( ( ( 0 −ℝ 𝐴 ) + ( 0 −ℝ 𝐵 ) ) + ( 𝐵 + 𝐴 ) ) ↔ ( 𝐴 + 𝐵 ) = ( 𝐵 + 𝐴 ) ) ) |
| 45 | 41 44 | mpbid | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ∧ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) → ( 𝐴 + 𝐵 ) = ( 𝐵 + 𝐴 ) ) |
| 46 | 3 4 7 45 | ccase | ⊢ ( ( ( 𝐴 ∈ ℕ0 ∨ ( 𝐴 ∈ ℝ ∧ ( 0 −ℝ 𝐴 ) ∈ ℕ ) ) ∧ ( 𝐵 ∈ ℕ0 ∨ ( 𝐵 ∈ ℝ ∧ ( 0 −ℝ 𝐵 ) ∈ ℕ ) ) ) → ( 𝐴 + 𝐵 ) = ( 𝐵 + 𝐴 ) ) |
| 47 | 1 2 46 | syl2anb | ⊢ ( ( 𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ ) → ( 𝐴 + 𝐵 ) = ( 𝐵 + 𝐴 ) ) |