Program Verification in the presence of complex numbers, functions with branch cuts etc

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Abstract

In considering the reliability of numerical programs, it is normal to \limit
our study to the semantics dealing with numerical precision" (Martel,
2005) [Mar05]. On the other hand, there is a great deal of work on the
reliability of programs that essentially ignores the numerics. The thesis
of this paper is that there is a class of problems that fall between these
two, which could be described as \does the low-level arithmetic imple-
ment the high-level mathematics". Many of these problems arise because
mathematics, particularly the mathematics of the complex numbers, is
more dicult than expected: for example the complex function log is
not continuous, writing down a program to compute an inverse function
is more complicated than just solving an equation, and many algebraic
simplication rules are not universally valid.
The good news is that these problems are theoretically capable of being
solved, and are practically close to being solved, but not yet solved, in
several real-world examples. However, there is still a long way to go
before implementations match the theoretical possibilities.
Original languageEnglish
Publication statusPublished - 26 Sep 2012
EventSYNASC 2012: 14th International Symposium on Symbolic and Numeric Algorithms for Scientific Computing - Timisoara, Romania
Duration: 25 Sep 201228 Sep 2012

Conference

ConferenceSYNASC 2012: 14th International Symposium on Symbolic and Numeric Algorithms for Scientific Computing
CountryRomania
CityTimisoara
Period25/09/1228/09/12

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  • Cite this

    Davenport, J. (2012). Program Verification in the presence of complex numbers, functions with branch cuts etc. Paper presented at SYNASC 2012: 14th International Symposium on Symbolic and Numeric Algorithms for Scientific Computing, Timisoara, Romania.