Theorem abssge0 28154

Description: The absolute value of a surreal number is non-negative. (Contributed by Scott Fenton, 16-Apr-2025.)

Assertion

Ref	Expression
abssge0	⊢ (𝐴 ∈ No → 0s ≤s (abss‘𝐴))

Proof of Theorem abssge0

Step	Hyp	Ref	Expression
1		id 22	. . . . 5 ⊢ ( 0s ≤s 𝐴 → 0s ≤s 𝐴)
2		iftrue 4497	. . . . 5 ⊢ ( 0s ≤s 𝐴 → if( 0s ≤s 𝐴, 𝐴, ( -us ‘𝐴)) = 𝐴)
3	1, 2	breqtrrd 5138	. . . 4 ⊢ ( 0s ≤s 𝐴 → 0s ≤s if( 0s ≤s 𝐴, 𝐴, ( -us ‘𝐴)))
4	3	adantr 480	. . 3 ⊢ (( 0s ≤s 𝐴 ∧ 𝐴 ∈ No ) → 0s ≤s if( 0s ≤s 𝐴, 𝐴, ( -us ‘𝐴)))
5		negs0s 27939	. . . . 5 ⊢ ( -us ‘ 0s ) = 0s
6		0sno 27745	. . . . . . . . 9 ⊢ 0s ∈ No
7		sletric 27683	. . . . . . . . 9 ⊢ (( 0s ∈ No ∧ 𝐴 ∈ No ) → ( 0s ≤s 𝐴 ∨ 𝐴 ≤s 0s ))
8	6, 7	mpan 690	. . . . . . . 8 ⊢ (𝐴 ∈ No → ( 0s ≤s 𝐴 ∨ 𝐴 ≤s 0s ))
9	8	ord 864	. . . . . . 7 ⊢ (𝐴 ∈ No → (¬ 0s ≤s 𝐴 → 𝐴 ≤s 0s ))
10	9	impcom 407	. . . . . 6 ⊢ ((¬ 0s ≤s 𝐴 ∧ 𝐴 ∈ No ) → 𝐴 ≤s 0s )
11		simpr 484	. . . . . . 7 ⊢ ((¬ 0s ≤s 𝐴 ∧ 𝐴 ∈ No ) → 𝐴 ∈ No )
12	6	a1i 11	. . . . . . 7 ⊢ ((¬ 0s ≤s 𝐴 ∧ 𝐴 ∈ No ) → 0s ∈ No )
13	11, 12	slenegd 27961	. . . . . 6 ⊢ ((¬ 0s ≤s 𝐴 ∧ 𝐴 ∈ No ) → (𝐴 ≤s 0s ↔ ( -us ‘ 0s ) ≤s ( -us ‘𝐴)))
14	10, 13	mpbid 232	. . . . 5 ⊢ ((¬ 0s ≤s 𝐴 ∧ 𝐴 ∈ No ) → ( -us ‘ 0s ) ≤s ( -us ‘𝐴))
15	5, 14	eqbrtrrid 5146	. . . 4 ⊢ ((¬ 0s ≤s 𝐴 ∧ 𝐴 ∈ No ) → 0s ≤s ( -us ‘𝐴))
16		iffalse 4500	. . . . 5 ⊢ (¬ 0s ≤s 𝐴 → if( 0s ≤s 𝐴, 𝐴, ( -us ‘𝐴)) = ( -us ‘𝐴))
17	16	adantr 480	. . . 4 ⊢ ((¬ 0s ≤s 𝐴 ∧ 𝐴 ∈ No ) → if( 0s ≤s 𝐴, 𝐴, ( -us ‘𝐴)) = ( -us ‘𝐴))
18	15, 17	breqtrrd 5138	. . 3 ⊢ ((¬ 0s ≤s 𝐴 ∧ 𝐴 ∈ No ) → 0s ≤s if( 0s ≤s 𝐴, 𝐴, ( -us ‘𝐴)))
19	4, 18	pm2.61ian 811	. 2 ⊢ (𝐴 ∈ No → 0s ≤s if( 0s ≤s 𝐴, 𝐴, ( -us ‘𝐴)))
20		abssval 28148	. 2 ⊢ (𝐴 ∈ No → (abss‘𝐴) = if( 0s ≤s 𝐴, 𝐴, ( -us ‘𝐴)))
21	19, 20	breqtrrd 5138	1 ⊢ (𝐴 ∈ No → 0s ≤s (abss‘𝐴))

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 395   ∨ wo 847   = wceq 1540   ∈ wcel 2109  ifcif 4491   class class class wbr 5110  ‘cfv 6514   No csur 27558   ≤s csle 27663   0_s c0s 27741   -u_s cnegs 27932  abs_scabss 28146

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2702  ax-rep 5237  ax-sep 5254  ax-nul 5264  ax-pow 5323  ax-pr 5390  ax-un 7714

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2534  df-eu 2563  df-clab 2709  df-cleq 2722  df-clel 2804  df-nfc 2879  df-ne 2927  df-ral 3046  df-rex 3055  df-rmo 3356  df-reu 3357  df-rab 3409  df-v 3452  df-sbc 3757  df-csb 3866  df-dif 3920  df-un 3922  df-in 3924  df-ss 3934  df-pss 3937  df-nul 4300  df-if 4492  df-pw 4568  df-sn 4593  df-pr 4595  df-tp 4597  df-op 4599  df-ot 4601  df-uni 4875  df-int 4914  df-iun 4960  df-br 5111  df-opab 5173  df-mpt 5192  df-tr 5218  df-id 5536  df-eprel 5541  df-po 5549  df-so 5550  df-fr 5594  df-se 5595  df-we 5596  df-xp 5647  df-rel 5648  df-cnv 5649  df-co 5650  df-dm 5651  df-rn 5652  df-res 5653  df-ima 5654  df-pred 6277  df-ord 6338  df-on 6339  df-suc 6341  df-iota 6467  df-fun 6516  df-fn 6517  df-f 6518  df-f1 6519  df-fo 6520  df-f1o 6521  df-fv 6522  df-riota 7347  df-ov 7393  df-oprab 7394  df-mpo 7395  df-1st 7971  df-2nd 7972  df-frecs 8263  df-wrecs 8294  df-recs 8343  df-1o 8437  df-2o 8438  df-nadd 8633  df-no 27561  df-slt 27562  df-bday 27563  df-sle 27664  df-sslt 27700  df-scut 27702  df-0s 27743  df-made 27762  df-old 27763  df-left 27765  df-right 27766  df-norec 27852  df-norec2 27863  df-adds 27874  df-negs 27934  df-abss 28147

This theorem is referenced by:  remulscllem2  28359