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| Description: Subclass transitivity deduction. |
| Ref | Expression |
|---|---|
| sstrd.1 |
|
| sstrd.2 |
|
| Ref | Expression |
|---|---|
| sstrd |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sstr 2072 |
. 2
| |
| 2 | sstrd.1 |
. 2
| |
| 3 | sstrd.2 |
. 2
| |
| 4 | 1, 2, 3 | sylanc 471 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: sylan9ss 2075 sspr 2475 ssxpr 3475 relfld 3515 fimacnv 3810 1stcof 4101 omwordri 4203 oewordri 4219 sbthlem1 4447 fsum1ps 7018 neiss 7723 lpss 7746 bcthlem18 8016 nmoxr 8429 nmolb 8434 nmoubi 8435 ubthlem6 8534 shintcl 9293 shub1t 9352 nmopxrt 9793 nmfnxrt 9806 nmoplbt 9831 nmopubt 9832 nmfnlbt 9848 nmfnleubt 9849 nmopunt 9939 branmfnt 10038 ssmd2 10239 mdslmd1lem1 10252 mdexch 10262 irredlem1 10317 mdsymlem5 10334 sumdmdi 10342 sumdmdlem2 10346 fgsb2 10580 |
| 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-in 2051 df-ss 2053 |