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| Description: The first abstraction variable in an ordered-pair class abstraction (class builder) is effectively not free. |
| Ref | Expression |
|---|---|
| hbopab1 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-opab 2662 |
. 2
| |
| 2 | hbe1 1014 |
. . 3
| |
| 3 | 2 | hbab 1465 |
. 2
|
| 4 | 1, 3 | hbxfr 1560 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: opabsb 2810 ssopab2 2817 dmopab 3315 rnopab 3347 cnvopab 3437 funopab 3540 zfrep6 3606 fnopabg 3607 fvopab5 3784 elrnopabg 3791 fopab2 3814 rnssopab 3816 fopabco 3823 fopabsn 3831 abrexexlem2 3850 rdgsucopab 3937 rdgsucopabn 3938 frsucopab 3945 abianfplem 3952 dom2d 4391 pw2en 4432 mapxpen 4481 xpmapenlem1 4482 xpmapenlem4 4485 unbnn 4527 inf0 4586 trcl 4625 ac6lem 4734 iundom 4792 alephfplem2 4877 om2uzsuc 6241 hbsum1 6929 fsumserz2 6949 serzfsum 6950 fsum1 6951 fsump1 6952 isumval2t 7138 isumclim3t 7143 isumclim4t 7144 isumcmpi 7158 geoisum1c 7188 cnlnadjlem5 9942 hbcmpt 10394 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 960 ax-gen 961 ax-8 962 ax-10 964 ax-12 966 ax-17 969 ax-4 971 ax-5o 973 ax-6o 976 ax-9o 1121 ax-10o 1138 ax-16 1208 ax-11o 1216 ax-ext 1457 |
| This theorem depends on definitions: df-bi 147 df-an 225 df-ex 979 df-sb 1170 df-clab 1462 df-cleq 1467 df-clel 1470 df-opab 2662 |