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УК гд а Уж × в

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A<br />

ÌØÙÒØÓÒ<strong>×</strong><br />

ÌÒÙ<strong>×</strong>¹ÓÒØØÙÒØÓÒ<strong>×</strong>ÖÒÝ º½ ÒÙ<strong>×</strong>¹ÓÒØØÙÒØÓÒ<strong>×</strong><br />

´º½µ<br />

z)ÙÒÖÑÓÙÐÖØÖÒ<strong>×</strong>ÓÖÑØÓÒ<strong>×</strong><strong>×</strong>ÚÒÝ<br />

)º<br />

)¸ ÛÖa.b ∈ (0, 1) mod 0]<br />

2ºÇÒ<strong>×</strong>ϑ (z1 , z 2<br />

]<br />

(z1 , z 2 1]<br />

)Òϑ (z1 , z 2<br />

ÌØÖÒ<strong>×</strong>ÓÖÑØÓÒ<strong>×</strong>Óϑ 1<br />

´º¾µ<br />

(τ,<br />

ÌÒØÙÒØÓÒη(τ)<strong>×</strong>ÒÝ<br />

ÌØÖÒ<strong>×</strong>ÓÖÑØÓÒÓØÒØÙÒØÓÒÙÒÖØÑÓÙÐÖÖÓÙÔ<strong>×</strong>ÚÒÝ´º¿µ<br />

(1 − q n ) .<br />

ϑ 3 (z 1 , z 2 ) ≡ θ [ 0<br />

0<br />

[ a<br />

θ (z 1 , z 2 ) =<br />

b] ∑ q 1 2 (l+ a 2 )2 r (l+ a 2 ) e iπlb ,<br />

l∈Z<br />

1<br />

4<br />

(z 1 , z 2 ) ≡ θ [ 0<br />

ÛØq= exp(2πiτ)Òr=exp(2πiz)º<br />

(z 1 , z 2 ) ≡ θ [ ]<br />

1 (z1 , z 2 )¸ϑ 2 (z 1 , z 2 ) ≡ θ [ 1<br />

T : ϑ 1 (τ + 1, z) = e iπ/4 ϑ 1 (τ, z) ,<br />

S : ϑ 1 (−1/τ, −z/τ) = − 1<br />

q 1/2 r eπiz2 /τ ϑ 1 (τ, z) ,<br />

η(τ) = e 2πiτ/24 ∞<br />

∏<br />

n=1<br />

1<br />

T : η(τ + 1) = e πi/12 η(τ) ,<br />

S : η(−1/τ) = e −πi/4 (τ) 1/2 η(τ) . ´ºµ<br />

½

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