Proof of Theorem isotrALT
| Step | Hyp | Ref
| Expression |
| 1 | | pm3.26 319 |
. . . . . 6
      

                     |
| 2 | | pm3.26 319 |
. . . . . 6
      

                     |
| 3 | 1, 2 | anim12i 333 |
. . . . 5
       

                    

                            |
| 4 | 3 | ancoms 436 |
. . . 4
       

                    

                            |
| 5 | | f1oco 3692 |
. . . 4
                   |
| 6 | 4, 5 | syl 10 |
. . 3
       

                    

                        |
| 7 | | ax-17 968 |
. . . . . 6
            |
| 8 | | hbra1 1679 |
. . . . . 6
                   

                |
| 9 | 7, 8 | hban 1006 |
. . . . 5
      

                                         |
| 10 | | ax-17 968 |
. . . . 5
      

                                         |
| 11 | 9, 10 | hban 1006 |
. . . 4
       

                    

                        

                    

                  |
| 12 | | ax-17 968 |
. . . . . . 7
            |
| 13 | | ax-17 968 |
. . . . . . . 8

   |
| 14 | | hbra1 1679 |
. . . . . . . 8
                                   |
| 15 | 13, 14 | hbral 1678 |
. . . . . . 7
                    
                |
| 16 | 12, 15 | hban 1006 |
. . . . . 6
      

                                         |
| 17 | | ax-17 968 |
. . . . . 6
      

                                         |
| 18 | 16, 17 | hban 1006 |
. . . . 5
       

                    

                        

                    

                  |
| 19 | | f1of 3674 |
. . . . . . . . . . 11
           |
| 20 | | ffvelrn 3799 |
. . . . . . . . . . . . 13
     
       |
| 21 | 20 | ex 373 |
. . . . . . . . . . . 12
             |
| 22 | | ffvelrn 3799 |
. . . . . . . . . . . . 13
     
       |
| 23 | 22 | ex 373 |
. . . . . . . . . . . 12
             |
| 24 | 21, 23 | anim12d 556 |
. . . . . . . . . . 11
            
        |
| 25 | 19, 24 | syl 10 |
. . . . . . . . . 10
            
        |
| 26 | 25 | adantr 389 |
. . . . . . . . 9
      

                      
        |
| 27 | | breq1 2612 |
. . . . . . . . . . . . 13
                 |
| 28 | | fveq2 3709 |
. . . . . . . . . . . . . 14
                   |
| 29 | 28 | breq1d 2619 |
. . . . . . . . . . . . 13
                                 |
| 30 | 27, 29 | bibi12d 627 |
. . . . . . . . . . . 12
                                             |
| 31 | | breq2 2613 |
. . . . . . . . . . . . 13
                         |
| 32 | | fveq2 3709 |
. . . . . . . . . . . . . 14
                   |
| 33 | 32 | breq2d 2620 |
. . . . . . . . . . . . 13
                                         |
| 34 | 31, 33 | bibi12d 627 |
. . . . . . . . . . . 12
                                                             |
| 35 | 30, 34 | rcla42v 1871 |
. . . . . . . . . . 11
             
                                               |
| 36 | 35 | com12 11 |
. . . . . . . . . 10
                                                             |
| 37 | 36 | adantl 388 |
. . . . . . . . 9
      

                                                           |
| 38 | 26, 37 | sylan9 468 |
. . . . . . . 8
       

                    

            |