| Step | Hyp | Ref | Expression | 
						
							| 1 |  | fveq2 |  | 
						
							| 2 | 1 | sseq1d |  | 
						
							| 3 | 2 | imbi2d |  | 
						
							| 4 |  | fveq2 |  | 
						
							| 5 | 4 | sseq1d |  | 
						
							| 6 | 5 | imbi2d |  | 
						
							| 7 |  | fveq2 |  | 
						
							| 8 | 7 | sseq1d |  | 
						
							| 9 | 8 | imbi2d |  | 
						
							| 10 |  | fveq2 |  | 
						
							| 11 | 10 | sseq1d |  | 
						
							| 12 | 11 | imbi2d |  | 
						
							| 13 |  | ssid |  | 
						
							| 14 | 13 | 2a1i |  | 
						
							| 15 |  | simprl |  | 
						
							| 16 |  | recnprss |  | 
						
							| 17 | 16 | ad2antrr |  | 
						
							| 18 | 17 | adantr |  | 
						
							| 19 |  | simplll |  | 
						
							| 20 |  | eluznn0 |  | 
						
							| 21 | 20 | adantll |  | 
						
							| 22 | 21 | adantr |  | 
						
							| 23 |  | dvnf |  | 
						
							| 24 | 19 15 22 23 | syl3anc |  | 
						
							| 25 |  | dvnbss |  | 
						
							| 26 | 19 15 22 25 | syl3anc |  | 
						
							| 27 |  | dvnp1 |  | 
						
							| 28 | 18 15 22 27 | syl3anc |  | 
						
							| 29 |  | simprr |  | 
						
							| 30 | 28 29 | eqeltrrd |  | 
						
							| 31 |  | cncff |  | 
						
							| 32 | 30 31 | syl |  | 
						
							| 33 | 32 | fdmd |  | 
						
							| 34 |  | cnex |  | 
						
							| 35 |  | elpm2g |  | 
						
							| 36 | 34 19 35 | sylancr |  | 
						
							| 37 | 15 36 | mpbid |  | 
						
							| 38 | 37 | simprd |  | 
						
							| 39 | 26 38 | sstrd |  | 
						
							| 40 | 18 24 39 | dvbss |  | 
						
							| 41 | 33 40 | eqsstrrd |  | 
						
							| 42 | 26 41 | eqssd |  | 
						
							| 43 | 42 | feq2d |  | 
						
							| 44 | 24 43 | mpbid |  | 
						
							| 45 |  | dvcn |  | 
						
							| 46 | 18 44 38 33 45 | syl31anc |  | 
						
							| 47 | 15 46 | jca |  | 
						
							| 48 | 47 | ex |  | 
						
							| 49 |  | peano2nn0 |  | 
						
							| 50 | 21 49 | syl |  | 
						
							| 51 |  | elcpn |  | 
						
							| 52 | 17 50 51 | syl2anc |  | 
						
							| 53 |  | elcpn |  | 
						
							| 54 | 17 21 53 | syl2anc |  | 
						
							| 55 | 48 52 54 | 3imtr4d |  | 
						
							| 56 | 55 | ssrdv |  | 
						
							| 57 |  | sstr2 |  | 
						
							| 58 | 56 57 | syl |  | 
						
							| 59 | 58 | expcom |  | 
						
							| 60 | 59 | a2d |  | 
						
							| 61 | 3 6 9 12 14 60 | uzind4 |  | 
						
							| 62 | 61 | com12 |  | 
						
							| 63 | 62 | 3impia |  |