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Mirrors > Home > MPE Home > Th. List > con1d | Structured version Visualization version GIF version |
Description: A contraposition deduction. (Contributed by NM, 27-Dec-1992.) |
Ref | Expression |
---|---|
con1d.1 | ⊢ (𝜑 → (¬ 𝜓 → 𝜒)) |
Ref | Expression |
---|---|
con1d | ⊢ (𝜑 → (¬ 𝜒 → 𝜓)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | con1d.1 | . . 3 ⊢ (𝜑 → (¬ 𝜓 → 𝜒)) | |
2 | notnot 144 | . . 3 ⊢ (𝜒 → ¬ ¬ 𝜒) | |
3 | 1, 2 | syl6 35 | . 2 ⊢ (𝜑 → (¬ 𝜓 → ¬ ¬ 𝜒)) |
4 | 3 | con4d 115 | 1 ⊢ (𝜑 → (¬ 𝜒 → 𝜓)) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem is referenced by: con1 148 mt3d 150 pm2.24d 154 con3d 155 pm2.61d 181 pm2.8 969 dedlem0b 1039 meredith 1638 necon3bd 3030 necon1bd 3034 spc2d 3602 sspss 4075 neldif 4105 ssonprc 7501 limsssuc 7559 limom 7589 onfununi 7972 pw2f1olem 8615 domtriord 8657 pssnn 8730 ordtypelem10 8985 rankxpsuc 9305 carden2a 9389 fidomtri2 9417 alephdom 9501 isf32lem12 9780 isfin1-3 9802 isfin7-2 9812 entric 9973 inttsk 10190 zeo 12062 zeo2 12063 xrlttri 12526 xaddf 12611 elfzonelfzo 13133 fzonfzoufzol 13134 elfznelfzo 13136 om2uzf1oi 13315 hashnfinnn0 13716 ruclem3 15580 sumodd 15733 bitsinv1lem 15784 sadcaddlem 15800 phiprmpw 16107 iserodd 16166 fldivp1 16227 prmpwdvds 16234 vdwlem6 16316 sylow2alem2 18737 efgs1b 18856 fctop 21606 cctop 21608 ppttop 21609 iccpnfcnv 23542 iccpnfhmeo 23543 iscau2 23874 ovolicc2lem2 24113 mbfeqalem1 24236 limccnp2 24484 radcnv0 24998 psercnlem1 25007 pserdvlem2 25010 logtayl 25237 cxpsqrt 25280 rlimcnp2 25538 amgm 25562 pntpbnd1 26156 pntlem3 26179 atssma 30149 fsuppcurry1 30455 fsuppcurry2 30456 supxrnemnf 30487 xrge0iifcnv 31171 eulerpartlemf 31623 cusgracyclt3v 32398 nolesgn2o 33173 arg-ax 33759 pw2f1ocnv 39627 infordmin 39892 clsk1independent 40389 pm10.57 40696 con5 40849 con3ALT2 40857 xrred 41626 afvco2 43369 islininds2 44533 |
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