| Step | Hyp | Ref | Expression | 
						
							| 1 |  | ishst |  | 
						
							| 2 | 1 | simp3bi |  | 
						
							| 3 | 2 | ad2antrr |  | 
						
							| 4 |  | sseq1 |  | 
						
							| 5 |  | fveq2 |  | 
						
							| 6 | 5 | oveq1d |  | 
						
							| 7 | 6 | eqeq1d |  | 
						
							| 8 |  | fvoveq1 |  | 
						
							| 9 | 5 | oveq1d |  | 
						
							| 10 | 8 9 | eqeq12d |  | 
						
							| 11 | 7 10 | anbi12d |  | 
						
							| 12 | 4 11 | imbi12d |  | 
						
							| 13 |  | fveq2 |  | 
						
							| 14 | 13 | sseq2d |  | 
						
							| 15 |  | fveq2 |  | 
						
							| 16 | 15 | oveq2d |  | 
						
							| 17 | 16 | eqeq1d |  | 
						
							| 18 |  | oveq2 |  | 
						
							| 19 | 18 | fveq2d |  | 
						
							| 20 | 15 | oveq2d |  | 
						
							| 21 | 19 20 | eqeq12d |  | 
						
							| 22 | 17 21 | anbi12d |  | 
						
							| 23 | 14 22 | imbi12d |  | 
						
							| 24 | 12 23 | rspc2v |  | 
						
							| 25 | 24 | com23 |  | 
						
							| 26 | 25 | impr |  | 
						
							| 27 | 26 | adantll |  | 
						
							| 28 | 3 27 | mpd |  |