| Metamath Proof Explorer |
< Previous
Next >
Related theorems Unicode version |
| Description: The domain of a set is a set. Corollary 6.8(2) of [TakeutiZaring] p. 26. |
| Ref | Expression |
|---|---|
| dmexg |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | uniexg 2867 |
. 2
| |
| 2 | uniexg 2867 |
. 2
| |
| 3 | ssun1 2190 |
. . . 4
| |
| 4 | dmrnssfld 3353 |
. . . 4
| |
| 5 | 3, 4 | sstri 2070 |
. . 3
|
| 6 | ssexg 2717 |
. . 3
| |
| 7 | 5, 6 | mpan 694 |
. 2
|
| 8 | 1, 2, 7 | 3syl 20 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: dmex 3356 inelv 3358 xpexr2 3476 cnvexg 3515 coexg 3520 cofunexg 3576 dmfex 3650 imadomg 4789 ismet 7758 metxp 7796 blfval 7797 blval 7799 blrn 7803 blf 7806 opnfval 7819 isopn 7821 lmfval 7887 caufval 7888 lmbr 7890 iscau 7898 bcthlem12 7972 bcthlem15 7975 bcthlem30 7990 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 961 ax-gen 962 ax-8 963 ax-10 965 ax-11 966 ax-12 967 ax-13 968 ax-14 969 ax-17 970 ax-4 972 ax-5o 974 ax-6o 977 ax-9o 1122 ax-10o 1139 ax-16 1209 ax-11o 1217 ax-ext 1458 ax-sep 2699 ax-pow 2738 ax-pr 2775 ax-un 2862 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 980 df-sb 1171 df-eu 1381 df-mo 1382 df-clab 1463 df-cleq 1468 df-clel 1471 df-ne 1585 df-v 1809 df-dif 2046 df-un 2047 df-in 2048 df-ss 2050 df-nul 2278 df-pw 2399 df-sn 2409 df-pr 2410 df-op 2413 df-uni 2500 df-br 2616 df-opab 2663 df-cnv 3182 df-dm 3184 df-rn 3185 |