| Step | Hyp | Ref | Expression | 
						
							| 1 |  | pmapsub.b |  | 
						
							| 2 |  | pmapsub.s |  | 
						
							| 3 |  | pmapsub.m |  | 
						
							| 4 |  | eqid |  | 
						
							| 5 |  | eqid |  | 
						
							| 6 | 1 4 5 3 | pmapval |  | 
						
							| 7 |  | breq1 |  | 
						
							| 8 | 7 | elrab |  | 
						
							| 9 | 1 5 | atbase |  | 
						
							| 10 | 9 | anim1i |  | 
						
							| 11 | 8 10 | sylbi |  | 
						
							| 12 |  | breq1 |  | 
						
							| 13 | 12 | elrab |  | 
						
							| 14 | 1 5 | atbase |  | 
						
							| 15 | 14 | anim1i |  | 
						
							| 16 | 13 15 | sylbi |  | 
						
							| 17 | 11 16 | anim12i |  | 
						
							| 18 |  | an4 |  | 
						
							| 19 | 17 18 | sylib |  | 
						
							| 20 | 19 | anim2i |  | 
						
							| 21 | 1 5 | atbase |  | 
						
							| 22 |  | eqid |  | 
						
							| 23 | 1 4 22 | latjle12 |  | 
						
							| 24 | 23 | biimpd |  | 
						
							| 25 | 24 | 3exp2 |  | 
						
							| 26 | 25 | impd |  | 
						
							| 27 | 26 | com23 |  | 
						
							| 28 | 27 | imp43 |  | 
						
							| 29 | 28 | adantr |  | 
						
							| 30 | 1 22 | latjcl |  | 
						
							| 31 | 30 | 3expib |  | 
						
							| 32 | 1 4 | lattr |  | 
						
							| 33 | 32 | 3exp2 |  | 
						
							| 34 | 33 | com24 |  | 
						
							| 35 | 31 34 | syl5d |  | 
						
							| 36 | 35 | imp41 |  | 
						
							| 37 | 36 | adantlrr |  | 
						
							| 38 | 29 37 | mpan2d |  | 
						
							| 39 | 20 21 38 | syl2an |  | 
						
							| 40 |  | simpr |  | 
						
							| 41 | 39 40 | jctild |  | 
						
							| 42 |  | breq1 |  | 
						
							| 43 | 42 | elrab |  | 
						
							| 44 | 41 43 | imbitrrdi |  | 
						
							| 45 | 44 | ralrimiva |  | 
						
							| 46 | 45 | ralrimivva |  | 
						
							| 47 |  | ssrab2 |  | 
						
							| 48 | 46 47 | jctil |  | 
						
							| 49 | 4 22 5 2 | ispsubsp |  | 
						
							| 50 | 49 | adantr |  | 
						
							| 51 | 48 50 | mpbird |  | 
						
							| 52 | 6 51 | eqeltrd |  |