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149
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COMBINATORICS
2000
15 years 6 months ago
2000
Recently Zagier proved a remarkable q-series identity. We show that this identity can also be proved by modifying Franklin's classical proof of Euler's pentagonal number...
137
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DT
2002
15 years 6 months ago
2002
nline search of authors and a broader subject search of abstracts of Young Children articles since 1985, volume 40, and of other articles published online since September 2002, vis...
166
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COMBINATORICS
1998
15 years 6 months ago
1998
It is shown that there are 2n n − n−1 m=0 2n−m−1 2m m permutations which are the union of an increasing sequence and a decreasing sequence. 1991 Mathematics Subject Classi...
160
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ITA
2002
15 years 6 months ago
2002
Word and tree codes are studied in a common framework, that of polypodes which are sets endowed with a substitution like operation. Many examples are given and basic properties are...
168
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COMBINATORICS
1999
15 years 6 months ago
1999
We prove that the threshold for a random graph to have a k-core is equal to the threshold for having a subgraph which meets a necessary condition of Gallai for being k-critical. 1...