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- Christian Hidber
- SIGMOD Conference
- 1999

We present a novel algorithm to compute large itemsets online. The user is free to change the support threshold any time during the first scan of the transaction sequence. The algorithm maintains a superset of all large itemsets and for each itemset a shrinking, deterministic interval on its support. After at most 2 scans the algorithm terminates with the… (More)

- Joseph M. Hellerstein, Ron Avnur, +5 authors Peter J. Haas
- IEEE Computer
- 1999

- Christian Hidber
- 1998

We show that the isoperimetric function of a nitely generated nilpotent group of class c is bounded above by a polynomial of degree 2c.

- Christian Hidber
- 1997

We show that amalgams of nitely generated torsionfree nilpotent groups of class c along a cyclic subgroup satisfy a polynomial isoperi-metric inequality of degree 4c 2. The distortion of the amalgamated subgroup is bounded above by a polynomial of degree c. We also give an example of a non-cyclic amalgam of nitely generated torsion-free nilpotent groups… (More)

- Christian Hidber
- 1998

We consider amalgamations of nitely generated nilpotent groups of class c. We show that doubles satisfy a polynomial isoperimetric inequality of degree 2c 2. Generalising doubles we i n troduce non-twisted amalgamations and show that they satisfy a polynomial isoperimetric inequality a s w ell. We give a suucient condition for amalgamations along abelian… (More)

- Christian Hidber
- 1996

We present a n i n tegration of Mathematica into Prolog using MathLink. We illustrate the interplay b e t w een the diierent components by e v aluating a simple example. The motivation based on algebraic modeling as well as an application from combina-torial group theory are brieey sketched.

- Joseph M Hellerstein, Ron Avnur, +5 authors Peter J Haas
- 1999

51 Interactive Data Analysis: The Control Project D ata analysis is fundamentally an iterative process in which you issue a query, receive a response, formulate the next query based on the response, and repeat. You usually don't issue a single, perfectly chosen query and get the information you want from a database; indeed, the purpose of data analysis is… (More)

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