1
(09-10-2014), (09-10-2014), (09-10-2014)
3 or -1
( ) - ... - 2021... 2021 -... 2018 ... 2024 -...
omega and omega squared 3 and -1
( ) k=0 k (w-)
(( )) 4 *** ( ... ... ( )
(09-11-2014), (09-11-2014)
: 1 (0 1 )
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