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 S I d Q T d I d c s d c q H T V T d o Uq e q e o U I e Q I X  I k I U X  P T S I H X q p x c P
 I d s w F T T • fd c H X H c d s T c R V I d I W ce d R h „ T V o dQ c c H T P P c ˜ rf x
 q H e I V I d S q P I d I X  I s s c s „ c U I h „ c h I s o U c d T s V f H Q d T p I kQ T I H X
0, 1, 2, 3, . . . ,
 — T • Y Uq X T s f P f d e c › h I I W I s p I k Q T c T s c H T t Q f n F — c h I H p P I d I X
. . . , ’3, ’2, ’1,
f p Y H Y T s c pc V V o d Q I P T pI kh I c s
— I h IQ f „ c T ˜ q e c UV  c T sc Uc p T c T s fd T S R V  T T •f H c X I c R s df H h I
YQ d r Y U V Y I X P I „ f H h I P R s s c V d Q c d Q c f U f S f s ” F I P f Q d c f d Q f H R V
c I s o U fd Q I T s c P c Q I W I s s c x f Q I X „ w F Y T s c xI s P q T Y T s c xI UQ Ü — T •
 f H c X I k q V p Y T s c p c V V T f p Y H I W I s o U f H q d f s Q YQ d c f s T S f s c Q {
F I d S f s – I s d Y s I X c s  YQ o d f H h I „ f H T U Q c  Y d I k  Y P c H V I P T p
 I kh I c s c xI d o Q c p ˆ F T s c P c H V I W I s P o s c S I o Q I U f V I h c H d I X q V dQ
 c S c V I U c S š f H I p T P I X T H d™ T š f • H q W I T H d™ k Y T • f q d T Q V T d Q I s
 ˜ h I c T S T U f s o d T s Q Yq R h I d ˜ F f UQ T S I W I s d e f H dQ h f T T • f s H f e s T
T s p I H Q I d S q P I d I X – s c x I U ” F YQ d c Y H I d V I X I d Q f S T YQ d c q H T U
 q P H I – I e W c U I d S q P I d I X – dQ I H i F s c xI UQ T d Q I H X T – d c V d „
ã â ” á ‘ ” Ð à ß ÞÌ Ë
‡ f e T d Q T g F Ý YQ d c f V T t c P V
c s I s V Y Yd I k d c Y U c pc H X I T d c f H T „ pf b F P I H pf e f „ d cq V dQ d qQ
 T H X Y P c H V c Q V  o s c d e f e  f • T s T pc Y f P T s P I d S d T pI k R V w

. 1
( 23 .)



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