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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 2667 |
. 2
| |
| 2 | hbe1 1016 |
. . 3
| |
| 3 | 2 | hbab 1467 |
. 2
|
| 4 | 1, 3 | hbxfr 1563 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: opabsb 2815 ssopab2 2822 dmopab 3320 rnopab 3353 cnvopab 3445 funopab 3548 zfrep6 3614 fnopabg 3615 fvopab5 3793 elrnopabg 3800 fopab2 3823 rnssopab 3825 fopabco 3832 fopabsn 3840 abrexexlem2 3859 rdgsucopab 3946 rdgsucopabn 3947 frsucopab 3954 abianfplem 3961 dom2d 4404 pw2en 4446 mapxpen 4495 xpmapenlem1 4496 xpmapenlem4 4499 unbnn 4544 inf0 4606 trcl 4645 ac6lem 4754 iundom 4812 alephfplem2 4897 om2uzsuc 6296 hbsum1 6983 fsumserz2 7003 serzfsum 7004 fsum1 7005 fsump1 7006 isumval2t 7194 isumclim3t 7200 isumclim4t 7201 isumcmpi 7215 geoisum1c 7245 cnlnadjlem5 10004 hbcmpt 10462 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 962 ax-gen 963 ax-8 964 ax-10 966 ax-12 968 ax-17 971 ax-4 973 ax-5o 975 ax-6o 978 ax-9o 1123 ax-10o 1140 ax-16 1210 ax-11o 1218 ax-ext 1459 |
| This theorem depends on definitions: df-bi 147 df-an 225 df-ex 981 df-sb 1172 df-clab 1464 df-cleq 1469 df-clel 1472 df-opab 2667 |