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Euler's partition theorem and the combinatorics of -sequences

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An l-nomial <strong><strong>the</strong>orem</strong> [LS]: An analog <strong>of</strong><br />

is<br />

n∑<br />

k=0<br />

( n<br />

k)<br />

z k = (1 + z) n<br />

n∑<br />

( ) n (l)<br />

z k =<br />

k<br />

k=0<br />

n−1<br />

∏<br />

i=0<br />

(u i−(n−1)/2<br />

l<br />

+ v i−(n−1)/2<br />

l<br />

z) =<br />

(1 + ∆ (l)<br />

1 z + z2 )(1 + ∆ (l)<br />

3 z + z2 ) · · · (1 + ∆ (l)<br />

n−1 z + z2 )<br />

(1 + z)(1 + ∆ (l)<br />

2 z + z2 )(1 + ∆ (l)<br />

4 z + z2 ) · · · (1 + ∆ (l)<br />

n−1 z + z2 )<br />

n even<br />

n odd

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