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- 54:: |- A e. dom area
- 55:: |- Q e. RR
- 56:: |- B = { <. x , y >. | ( <. x , y >. e. A /\ x <_ Q ) }
- 57:: |- C = { <. x , y >. | ( <. x , y >. e. A /\ Q <_ x ) }
- *extract facts about A
- 58::dmarea |- ( A e. dom area
- <-> ( A C_ ( RR X. RR ) /\ A. x e. RR ( A " { x } ) e. ( `' vol " RR )
- /\ ( x e. RR |-> ( vol ` ( A " { x } ) ) ) e. L^1 ) )
- 59:58:simp1bi |- ( A e. dom area -> A C_ ( RR X. RR ) )
- 60:58:simp2bi |- ( A e. dom area -> A. x e. RR ( A " { x } ) e. ( `' vol " RR ) )
- 61:54,59:ax-mp |- A C_ ( RR X. RR )
- 62:54,60:ax-mp |- A. x e. RR ( A " { x } ) e. ( `' vol " RR )
- 63:61:sseli |- ( <. x , y >. e. A -> <. x , y >. e. ( RR X. RR ) )
- *show A = B u. C
- *first A C_ B u. C
- 64::elun1 |- ( <. x , y >. e. B -> <. x , y >. e. ( B u. C ) )
- 65::elun2 |- ( <. x , y >. e. C -> <. x , y >. e. ( B u. C ) )
- 66::letric |- ( ( x e. RR /\ Q e. RR ) -> ( x <_ Q \/ Q <_ x ) )
- 67:55,66:mpan2 |- ( x e. RR -> ( x <_ Q \/ Q <_ x ) )
- 68:: |- ( ( <. x , y >. e. A /\ x <_ Q ) -> <. x , y >. e. B )
- 69:68,64:syl |- ( ( <. x , y >. e. A /\ x <_ Q ) -> <. x , y >. e. ( B u. C ) )
- 70:: |- ( ( <. x , y >. e. A /\ Q <_ x ) -> <. x , y >. e. C )
- 71:70,65:syl |- ( ( <. x , y >. e. A /\ Q <_ x ) -> <. x , y >. e. ( B u. C ) )
- 72:69,71:jaodan |- ( ( <. x , y >. e. A /\ ( x <_ Q \/ Q <_ x ) ) -> <. x , y >. e. ( B u. C ) )
- 73:67,72:sylan2 |- ( ( <. x , y >. e. A /\ x e. RR ) -> <. x , y >. e. ( B u. C ) )
- 74::opelxp1 |- ( <. x , y >. e. ( RR X. RR ) -> x e. RR )
- 75:63,74:syl |- ( <. x , y >. e. A -> x e. RR )
- 76:75:ancli |- ( <. x , y >. e. A -> ( <. x , y >. e. A /\ x e. RR ) )
- 77:76,73:syl |- ( <. x , y >. e. A -> <. x , y >. e. ( B u. C ) )
- 78::ssel |- ( &C1 C_ &C2 -> ( &C3 e. &C1 -> &C3 e. &C2 ) )
- !79:: |- A C_ ( B u. C )
- *second show B u. C C_ A
- 80:: |- ( B u. C ) C_ A
- 81:79,80:eqssi |- A = ( B u. C )
- *prove B e. dom area, C e. dom area
- * B C_ ( RR X. RR )
- 82::simpl |- ( ( <. x , y >. e. A /\ x <_ Q ) -> <. x , y >. e. A )
- 83:82:ssopab2i |- { <. x , y >. | ( <. x , y >. e. A /\ x <_ Q ) } C_ { <. x , y >. | <. x , y >. e. A }
- 84:63:ssopab2i |- { <. x , y >. | <. x , y >. e. A } C_ { <. x , y >. | <. x , y >. e. ( RR X. RR ) }
- 85:83,84:sstri |- { <. x , y >. | ( <. x , y >. e. A /\ x <_ Q ) } C_ { <. x , y >. | <. x , y >. e. ( RR X. RR ) }
- 86:56,85:eqsstri |- B C_ { <. x , y >. | <. x , y >. e. ( RR X. RR ) }
- 87::opelxp |- ( <. x , y >. e. ( RR X. RR ) <-> ( x e. RR /\ y e. RR ) )
- 88:87:opabbii |- { <. x , y >. | <. x , y >. e. ( RR X. RR ) } = { <. x , y >. | ( x e. RR /\ y e. RR ) }
- 89::df-xp |- ( RR X. RR ) = { <. x , y >. | ( x e. RR /\ y e. RR ) }
- 90:89,88:eqtr4i |- ( RR X. RR ) = { <. x , y >. | <. x , y >. e. ( RR X. RR ) }
- 91:86,90:sseqtr4i |- B C_ ( RR X. RR )
- * A. x e. RR ( B " { x } ) e. ( `' vol " RR )
- 92:: |- x <_ Q
- *show area A = area B + area C
- !93:: |- ( T. -> ( vol* ` ( R i^i S ) ) = 0 )
- !94:: |- ( T. -> RR = ( R u. S ) )
- !95:: |- ( ( T. /\ t e. RR ) -> A e. &C8 )
- !96:: |- ( T. -> ( t e. R |-> A ) e. L^1 )
- !97:: |- ( T. -> ( t e. S |-> A ) e. L^1 )
- 98:93,94,95,96,97:itgsplit
- |- ( T. -> S. RR A _d t = ( S. R A _d t + S. S A _d t ) )
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