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| Description: Subclass transitivity deduction. |
| Ref | Expression |
|---|---|
| sstrd.1 |
|
| sstrd.2 |
|
| Ref | Expression |
|---|---|
| sstrd |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sstr 2068 |
. 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 2071 sspr 2471 ssxpr 3467 relfld 3507 fimacnv 3801 1stcof 4091 omwordri 4193 oewordri 4209 sbthlem1 4433 ioossre 6336 fsum1ps 6964 neiss 7673 lpss 7696 bcthlem18 7966 nmoxr 8374 nmolb 8379 nmoubi 8380 ubthlem6 8478 shintcl 9231 shub1t 9290 nmopxrt 9733 nmfnxrt 9746 nmoplbt 9771 nmopubt 9772 nmfnlbt 9787 nmfnleubt 9788 nmopunt 9877 branmfnt 9976 ssmd2 10176 mdslmd1lem1 10189 mdexch 10199 irredlem1 10254 mdsymlem5 10271 sumdmdi 10278 sumdmdlem2 10282 fgsb2 10485 |
| 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-in 2047 df-ss 2049 |