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# User:Georg Fischer

From OeisWiki

## CV

- 1947 born in Waldshut, southern Germany.
- 1968 - 1975 Studies of Mathematics in Freiburg, and Computer Science in München, Germany.
- 1976 Software engineer at Softlab GmbH, München
- 1977 - 1980 Assistant at the Department of Computer Science, Dortmund, Germany. PhD in Compiler Construction: Incremental LR(1) Parser Construction as an Aid to Syntactical Extensibility
- 1980 - 1985 Chief consultant again at Softlab GmbH
- 1986 - 1994 Owner and Technical CEO at punctum GmbH, Munich (with two partners)
- 1995 - 1998 Maintenance and marketing of converter software
- 1999 - 2004 Freelancer in Y2K and other major conversion projects at Commerzbank
- 2005 - 2012 Principal Database Engineer at Commerzbank AG, Frankfurt, Germany
- 2012 - retired
- 2017 - IT-related development projects: microfinance database in Madagascar, Java programming training on Java (Bekasi, Indonesia)

## Interests

### OEIS

Please see **teherba.org** for my current OEIS activities, among them:

- Broken link checking and repairing in 2009, and occasionally, e.g.: 28 sequences citing M. Latapi
- Knuth's sequence A220952, and generation of similiar FASS curves
- A003121 Number of ways to arrange the numbers 1,2,...,n(n+1)/2 in a triangle so that the rows interlace, and modified Problem 18 of Clark Kimberling: 1, 2, 10, 1744, 2002568, 42263042752
- A131393 and 47 similiar "positive/negative" sequences A1313xx, A257nnn of Clark Kimberling

### Programming

- Java, database, web applications, programming languages (speaking ALGOL 60, FORTRAN, PL/1, Pascal, Simula 67, C, Perl, Java, XSLT, SQL, JavaScript, understanding COBOL)
- Symbolic computation (c.f. https://github.com/gfis/ramath)

### Number Theory

- Diophantine equations, especially power sums
- Fermat's lost proofs (except for FLT) with infinite descent