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Mirrors > Home > ILE Home > Th. List > sqrt1 | GIF version |
Description: The square root of 1 is 1. (Contributed by NM, 31-Jul-1999.) |
Ref | Expression |
---|---|
sqrt1 | ⊢ (√‘1) = 1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sq1 10539 | . . 3 ⊢ (1↑2) = 1 | |
2 | 1 | fveq2i 5484 | . 2 ⊢ (√‘(1↑2)) = (√‘1) |
3 | 1re 7890 | . . 3 ⊢ 1 ∈ ℝ | |
4 | 0le1 8371 | . . 3 ⊢ 0 ≤ 1 | |
5 | sqrtsq 10976 | . . 3 ⊢ ((1 ∈ ℝ ∧ 0 ≤ 1) → (√‘(1↑2)) = 1) | |
6 | 3, 4, 5 | mp2an 423 | . 2 ⊢ (√‘(1↑2)) = 1 |
7 | 2, 6 | eqtr3i 2187 | 1 ⊢ (√‘1) = 1 |
Colors of variables: wff set class |
Syntax hints: = wceq 1342 ∈ wcel 2135 class class class wbr 3977 ‘cfv 5183 (class class class)co 5837 ℝcr 7744 0cc0 7745 1c1 7746 ≤ cle 7926 2c2 8900 ↑cexp 10445 √csqrt 10928 |
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 604 ax-in2 605 ax-io 699 ax-5 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-13 2137 ax-14 2138 ax-ext 2146 ax-coll 4092 ax-sep 4095 ax-nul 4103 ax-pow 4148 ax-pr 4182 ax-un 4406 ax-setind 4509 ax-iinf 4560 ax-cnex 7836 ax-resscn 7837 ax-1cn 7838 ax-1re 7839 ax-icn 7840 ax-addcl 7841 ax-addrcl 7842 ax-mulcl 7843 ax-mulrcl 7844 ax-addcom 7845 ax-mulcom 7846 ax-addass 7847 ax-mulass 7848 ax-distr 7849 ax-i2m1 7850 ax-0lt1 7851 ax-1rid 7852 ax-0id 7853 ax-rnegex 7854 ax-precex 7855 ax-cnre 7856 ax-pre-ltirr 7857 ax-pre-ltwlin 7858 ax-pre-lttrn 7859 ax-pre-apti 7860 ax-pre-ltadd 7861 ax-pre-mulgt0 7862 ax-pre-mulext 7863 |
This theorem depends on definitions: df-bi 116 df-dc 825 df-3or 968 df-3an 969 df-tru 1345 df-fal 1348 df-nf 1448 df-sb 1750 df-eu 2016 df-mo 2017 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-ne 2335 df-nel 2430 df-ral 2447 df-rex 2448 df-reu 2449 df-rmo 2450 df-rab 2451 df-v 2724 df-sbc 2948 df-csb 3042 df-dif 3114 df-un 3116 df-in 3118 df-ss 3125 df-nul 3406 df-if 3517 df-pw 3556 df-sn 3577 df-pr 3578 df-op 3580 df-uni 3785 df-int 3820 df-iun 3863 df-br 3978 df-opab 4039 df-mpt 4040 df-tr 4076 df-id 4266 df-po 4269 df-iso 4270 df-iord 4339 df-on 4341 df-ilim 4342 df-suc 4344 df-iom 4563 df-xp 4605 df-rel 4606 df-cnv 4607 df-co 4608 df-dm 4609 df-rn 4610 df-res 4611 df-ima 4612 df-iota 5148 df-fun 5185 df-fn 5186 df-f 5187 df-f1 5188 df-fo 5189 df-f1o 5190 df-fv 5191 df-riota 5793 df-ov 5840 df-oprab 5841 df-mpo 5842 df-1st 6101 df-2nd 6102 df-recs 6265 df-frec 6351 df-pnf 7927 df-mnf 7928 df-xr 7929 df-ltxr 7930 df-le 7931 df-sub 8063 df-neg 8064 df-reap 8465 df-ap 8472 df-div 8561 df-inn 8850 df-2 8908 df-n0 9107 df-z 9184 df-uz 9459 df-seqfrec 10372 df-exp 10446 df-rsqrt 10930 |
This theorem is referenced by: sqrt2gt1lt2 10981 absi 10991 absefi 11699 sincos4thpi 13328 |
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