?t ??s ?ts ??r????? accumulation ?q??? t? 0? t??r? ?s ?? tr??s??r? ?t t?? ??? ?? t?? ???t?r ?? E 1 ? t?? ?r?????s r???r?s s??? t??t ????t 1 ??s tr??s??rr?? v t? ????t 2 ??? ???? ?????? ????t x s?t?s??s accumulation x = 1? ??? ???????? ?? E 1 ?rst ?????s ?? U (2) g ?t t??, 2? ??s ?ts ??r????? accumulation x ?q??? t? 0? ??? ???????? ???s ??t? V ,
???r t????? t????s t? t?? ??t active? ??r t?? ???t t??t ? ?????? ????t x ?? t??s ??t? ????s v ??r ?t ??st cv x ???s???t??? ????ts? ???s ,