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Theorem decsubi 9409

Description: Difference between a numeral 𝑀 and a nonnegative integer 𝑁 (no underflow). (Contributed by AV, 22-Jul-2021.) (Revised by AV, 6-Sep-2021.)

**Hypotheses**
Ref	Expression
decaddi.1	⊢ 𝐴 ∈ ℕ₀
decaddi.2	⊢ 𝐵 ∈ ℕ₀
decaddi.3	⊢ 𝑁 ∈ ℕ₀
decaddi.4	⊢ 𝑀 = ;𝐴𝐵
decaddci.5	⊢ (𝐴 + 1) = 𝐷
decsubi.5	⊢ (𝐵 − 𝑁) = 𝐶

**Assertion**
Ref	Expression
decsubi	⊢ (𝑀 − 𝑁) = ;𝐴𝐶

**Proof of Theorem decsubi**
Step	Hyp	Ref	Expression
1		10nn0 9364	. . . . 5 ⊢ ;10 ∈ ℕ₀
2		decaddi.1	. . . . 5 ⊢ 𝐴 ∈ ℕ₀
3	1, 2	nn0mulcli 9177	. . . 4 ⊢ (;10 · 𝐴) ∈ ℕ₀
4	3	nn0cni 9151	. . 3 ⊢ (;10 · 𝐴) ∈ ℂ
5		decaddi.2	. . . 4 ⊢ 𝐵 ∈ ℕ₀
6	5	nn0cni 9151	. . 3 ⊢ 𝐵 ∈ ℂ
7		decaddi.3	. . . 4 ⊢ 𝑁 ∈ ℕ₀
8	7	nn0cni 9151	. . 3 ⊢ 𝑁 ∈ ℂ
9	4, 6, 8	addsubassi 8214	. 2 ⊢ (((;10 · 𝐴) + 𝐵) − 𝑁) = ((;10 · 𝐴) + (𝐵 − 𝑁))
10		decaddi.4	. . . 4 ⊢ 𝑀 = ;𝐴𝐵
11		dfdec10 9350	. . . 4 ⊢ ;𝐴𝐵 = ((;10 · 𝐴) + 𝐵)
12	10, 11	eqtri 2192	. . 3 ⊢ 𝑀 = ((;10 · 𝐴) + 𝐵)
13	12	oveq1i 5867	. 2 ⊢ (𝑀 − 𝑁) = (((;10 · 𝐴) + 𝐵) − 𝑁)
14		dfdec10 9350	. . 3 ⊢ ;𝐴𝐶 = ((;10 · 𝐴) + 𝐶)
15		decsubi.5	. . . . 5 ⊢ (𝐵 − 𝑁) = 𝐶
16	15	eqcomi 2175	. . . 4 ⊢ 𝐶 = (𝐵 − 𝑁)
17	16	oveq2i 5868	. . 3 ⊢ ((;10 · 𝐴) + 𝐶) = ((;10 · 𝐴) + (𝐵 − 𝑁))
18	14, 17	eqtri 2192	. 2 ⊢ ;𝐴𝐶 = ((;10 · 𝐴) + (𝐵 − 𝑁))
19	9, 13, 18	3eqtr4i 2202	1 ⊢ (𝑀 − 𝑁) = ;𝐴𝐶

Colors of variables: wff set class

Syntax hints: = wceq 1349 ∈ wcel 2142 (class class class)co 5857 0cc0 7778 1c1 7779 + caddc 7781 · cmul 7783 − cmin 8094 ℕ₀cn0 9139 cdc 9347

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 610 ax-in2 611 ax-io 705 ax-5 1441 ax-7 1442 ax-gen 1443 ax-ie1 1487 ax-ie2 1488 ax-8 1498 ax-10 1499 ax-11 1500 ax-i12 1501 ax-bndl 1503 ax-4 1504 ax-17 1520 ax-i9 1524 ax-ial 1528 ax-i5r 1529 ax-14 2145 ax-ext 2153 ax-sep 4108 ax-pow 4161 ax-pr 4195 ax-setind 4522 ax-cnex 7869 ax-resscn 7870 ax-1cn 7871 ax-1re 7872 ax-icn 7873 ax-addcl 7874 ax-addrcl 7875 ax-mulcl 7876 ax-addcom 7878 ax-mulcom 7879 ax-addass 7880 ax-mulass 7881 ax-distr 7882 ax-i2m1 7883 ax-1rid 7885 ax-0id 7886 ax-rnegex 7887 ax-cnre 7889

This theorem depends on definitions: df-bi 116 df-3an 976 df-tru 1352 df-fal 1355 df-nf 1455 df-sb 1757 df-eu 2023 df-mo 2024 df-clab 2158 df-cleq 2164 df-clel 2167 df-nfc 2302 df-ne 2342 df-ral 2454 df-rex 2455 df-reu 2456 df-rab 2458 df-v 2733 df-sbc 2957 df-dif 3124 df-un 3126 df-in 3128 df-ss 3135 df-pw 3569 df-sn 3590 df-pr 3591 df-op 3593 df-uni 3798 df-int 3833 df-br 3991 df-opab 4052 df-id 4279 df-xp 4618 df-rel 4619 df-cnv 4620 df-co 4621 df-dm 4622 df-iota 5162 df-fun 5202 df-fv 5208 df-riota 5813 df-ov 5860 df-oprab 5861 df-mpo 5862 df-sub 8096 df-inn 8883 df-2 8941 df-3 8942 df-4 8943 df-5 8944 df-6 8945 df-7 8946 df-8 8947 df-9 8948 df-n0 9140 df-dec 9348

This theorem is referenced by: (None)

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