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Related theorems GIF version |
| Description: Express implication in terms of conjunction. |
| Ref | Expression |
|---|---|
| imnan | ⊢ ((φ → ¬ ψ) ↔ ¬ (φ ⋀ ψ)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-an 225 | . 2 ⊢ ((φ ⋀ ψ) ↔ ¬ (φ → ¬ ψ)) | |
| 2 | 1 | con2bii 221 | 1 ⊢ ((φ → ¬ ψ) ↔ ¬ (φ ⋀ ψ)) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 2 → wi 3 ↔ wb 146 ⋀ wa 223 |
| This theorem is referenced by: pm4.15 353 anass 439 pm5.18 659 pm5.17 667 dfbi 669 nan 688 ecase2d 750 nicodraw 950 alinexa 1040 dfsb3 1224 a12lem2 1375 a12study 1376 ralinexa 1680 eueq3 1915 ssnpss 2145 difin 2241 disj 2307 minel 2320 inssdif0 2329 sotric 2855 fr0 2922 dfwe2 2930 ordtri1 2975 ordsucss 3064 onuninsuc 3103 ordunisuc2 3110 funun 3546 imadif 3566 oalimcl 4184 omlimcl 4199 0nelqs 4288 unblem1 4523 suppr 4570 kmlem4 4748 alephnbtwn 4848 alephsucpw 4850 alephsucdom 4860 cfsuc 4895 genpnnp 5088 ltnsym2t 5514 xrltnsym2t 5532 nneo 6152 sqr2irrlem3 6664 aleph1re 7502 clsval2 7635 ntreq0 7658 bcthlem7 7955 nmounbi 8384 pilem1 8609 cvnsymt 10155 hatomistic 10226 cnfilca 10487 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 |
| This theorem depends on definitions: df-bi 147 df-an 225 |