| Metamath Proof Explorer |
< Previous
Next >
Related theorems Unicode version |
| Description: The empty function. |
| Ref | Expression |
|---|---|
| f0 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-f 3190 |
. 2
| |
| 2 | eqid 1474 |
. . 3
| |
| 3 | fn0 3601 |
. . 3
| |
| 4 | 2, 3 | mpbir 190 |
. 2
|
| 5 | rn0 3351 |
. . 3
| |
| 6 | 0ss 2298 |
. . 3
| |
| 7 | 5, 6 | eqsstr 2088 |
. 2
|
| 8 | 1, 4, 7 | mpbir2an 729 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: f00 3652 fconst 3653 f10 3708 fconstfv 3844 0met 7787 0alg 10605 |
| 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-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-rn 3185 df-fun 3188 df-fn 3189 df-f 3190 |