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Theorem normgt0tOLD 8988
Description: The norm of non-zero vector is positive.
Assertion
Ref Expression
normgt0tOLD (A → (¬ A = 0h ↔ 0 < (normhA)))

Proof of Theorem normgt0tOLD
StepHypRef Expression
1 sqrgt0t 6712 . . . . 5 (((A ·ih A) 0 < (A ·ih A)) → 0 < (√ ‘(A ·ih A)))
2 hiidrclt 8956 . . . . . 6 (A → (A ·ih A) )
32adantr 391 . . . . 5 ((A ¬ A = 0h) → (A ·ih A) )
4 ax-his4 8947 . . . . . 6 ((A A ≠ 0h) → 0 < (A ·ih A))
5 df-ne 1590 . . . . . 6 (A ≠ 0h ↔ ¬ A = 0h)
64, 5sylan2br 455 . . . . 5 ((A ¬ A = 0h) → 0 < (A ·ih A))
71, 3, 6sylanc 473 . . . 4 ((A ¬ A = 0h) → 0 < (√ ‘(A ·ih A)))
87ex 373 . . 3 (A → (¬ A = 0h → 0 < (√ ‘(A ·ih A))))
9 opreq1 3974 . . . . . . . . 9 (A = 0h → (A ·ih A) = (0h ·ih A))
10 hi01t 8957 . . . . . . . . 9 (A → (0h ·ih A) = 0)
119, 10sylan9eqr 1532 . . . . . . . 8 ((A A = 0h) → (A ·ih A) = 0)
1211fveq2d 3734 . . . . . . 7 ((A A = 0h) → (√ ‘(A ·ih A)) = (√ ‘0))
13 sqr0 6673 . . . . . . 7 (√ ‘0) = 0
1412, 13syl6eq 1526 . . . . . 6 ((A A = 0h) → (√ ‘(A ·ih A)) = 0)
1514ex 373 . . . . 5 (A → (A = 0h → (√ ‘(A ·ih A)) = 0))
16 sqrclt 6711 . . . . . . . . 9 (((A ·ih A) 0 ≤ (A ·ih A)) → (√ ‘(A ·ih A)) )
17 hiidge0t 8959 . . . . . . . . 9 (A → 0 ≤ (A ·ih A))
1816, 2, 17sylanc 473 . . . . . . . 8 (A → (√ ‘(A ·ih A)) )
19 0re 5452 . . . . . . . 8 0
2018, 19jctir 293 . . . . . . 7 (A → ((√ ‘(A ·ih A)) 0 ))
21 lttri3t 5526 . . . . . . 7 (((√ ‘(A ·ih A)) 0 ) → ((√ ‘(A ·ih A)) = 0 ↔ (¬ (√ ‘(A ·ih A)) < 0 ¬ 0 < (√ ‘(A ·ih A)))))
2220, 21syl 10 . . . . . 6 (A → ((√ ‘(A ·ih A)) = 0 ↔ (¬ (√ ‘(A ·ih A)) < 0 ¬ 0 < (√ ‘(A ·ih A)))))
23 pm3.27 323 . . . . . 6 ((¬ (√ ‘(A ·ih A)) < 0 ¬ 0 < (√ ‘(A ·ih A))) → ¬ 0 < (√ ‘(A ·ih A)))
2422, 23syl6bi 214 . . . . 5 (A → ((√ ‘(A ·ih A)) = 0 → ¬ 0 < (√ ‘(A ·ih A))))
2515, 24syld 27 . . . 4 (A → (A = 0h → ¬ 0 < (√ ‘(A ·ih A))))
2625con2d 91 . . 3 (A → (0 < (√ ‘(A ·ih A)) → ¬ A = 0h))
278, 26impbid 518 . 2 (A → (¬ A = 0h ↔ 0 < (√ ‘(A ·ih A))))
28 normvalt 8985 . . 3 (A → (normhA) = (√ ‘(A ·ih A)))
2928breq2d 2635 . 2 (A → (0 < (normhA) ↔ 0 < (√ ‘(A ·ih A))))
3027, 29bitr4d 533 1 (A → (¬ A = 0h ↔ 0 < (normhA)))
Colors of variables: wff set class
Syntax hints:  ¬ wn 2   → wi 3   ↔ wb 146   wa 223   = wceq 958   wcel 960   ≠ wne 1588   class class class wbr 2624   ‘cfv 3188  (class class class)co 3969  cr 5245  0cc0 5246   ≤ cle 5307   < clt 5498  √csqr 6670   chil 8783  0hc0v 8786   ·ih csp 8788  normhcno 8789
This theorem is referenced by:  nmcoplb 9953  lnopcon 9958  nmcfnlb 9982
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 964  ax-gen 965  ax-8 966  ax-9 967  ax-10 968  ax-11 969  ax-12 970  ax-13 971  ax-14 972  ax-17 973  ax-4 975  ax-5o 977  ax-6o 980  ax-9o 1125  ax-10o 1142  ax-16 1212  ax-11o 1220  ax-ext 1462  ax-rep 2698  ax-sep 2708  ax-nul 2715  ax-pow 2748  ax-pr 2785  ax-un 2872  ax-inf2 4634  ax-hv0cl 8868  ax-hvmul0 8875  ax-hfi 8941  ax-his1 8944  ax-his3 8946  ax-his4 8947
This theorem depends on definitions:  df-bi 147  df-or 224  df-an 225  df-3or 778  df-3an 779  df-ex 983  df-sb 1174  df-eu 1384  df-mo 1385  df-clab 1467  df-cleq 1472  df-clel 1475  df-ne 1590  df-nel 1591  df-ral 1652  df-rex 1653  df-reu 1654  df-rab 1655  df-v 1815  df-sbc 1945  df-csb 2005  df-dif 2052  df-un 2053  df-in 2054  df-ss 2056  df-pss 2058  df-nul 2284  df-if 2366  df-pw 2406  df-sn 2416  df-pr 2417  df-tp 2419  df-op 2420  df-uni 2508  df-int 2538  df-iun 2572  df-br 2625  df-opab 2672  df-tr 2686  df-eprel 2838  df-id 2841  df-po 2846  df-so 2856  df-fr 2923  df-we 2940  df-ord 2957  df-on 2958  df-lim 2959  df-suc 2960  df-om 3138  df-xp 3190  df-rel 3191  df-cnv 3192  df-co 3193  df-dm 3194  df-rn 3195  df-res 3196  df-ima 3197  df-fun 3198  df-fn 3199  df-f 3200  df-f1 3201  df-fo 3202  df-f1o 3203  df-fv 3204  df-rdg 3938  df-opr 3971  df-oprab 3972  df-1st 4085  df-2nd 4086  df-1o 4139  df-oadd 4141  df-omul 4142  df-er 4267  df-ec 4269  df-qs 4272  df-en 4374  df-dom 4375  df-sdom 4376  df-sup 4583  df-ni 5012  df-pli 5013  df-mi 5014  df-lti 5015  df-plpq 5047  df-mpq 5048  df-enq 5049  df-nq 5050  df-plq 5051  df-mq 5052  df-rq 5053  df-ltq 5054  df-1q 5055  df-np 5098  df-1p 5099  df-plp 5100  df-mp 5101  df-ltp 5102  df-plpr 5176  df-mpr 5177  df-enr 5178  df-nr 5179  df-plr 5180  df-mr 5181  df-ltr 5182  df-0r 5183  df-1r 5184  df-m1r 5185  df-c 5252  df-0 5253  df-1 5254  df-i 5255  df-r 5256  df-plus 5257  df-mul 5258  df-lt 5259  df-sub 5368  df-neg 5370  df-pnf 5499  df-mnf 5500  df-xr 5501  df-ltxr 5502  df-le 5503  df-div 5715  df-sqr 6671  df-re 6752  df-im 6753  df-cj 6754  df-hnorm 8832
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