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| Description: Membership of the empty set in an infinite Cartesian product. (Contributed by Steve Rodriguez, 29-Sep-2006.) |
| Ref | Expression |
|---|---|
| 0elixp |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0ex 2707 |
. . 3
| |
| 2 | 1 | snid 2432 |
. 2
|
| 3 | ixp0x 4352 |
. 2
| |
| 4 | 2, 3 | eleqtrr 1545 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| 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-nul 2706 ax-pow 2738 ax-pr 2775 |
| 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-ral 1647 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-br 2616 df-opab 2663 df-id 2831 df-xp 3180 df-rel 3181 df-cnv 3182 df-co 3183 df-dm 3184 df-fun 3188 df-fn 3189 df-ixp 4341 |