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# Journal Publications

Citation key | BL-Verification-Complexity-Of-Linear-Prime-Ideals |
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Author | Peter Bürgisser and Thomas Lickteig |

Pages | 247-267 |

Year | 1992 |

Journal | J. Pure Appl. Alg. |

Volume | 81 |

Abstract | The topic of this paper is the complexity of algebraic decision trees deciding membership in an algebraic subset $X$ in $R^m$ where $R$ is a real or algebraically closed field. We define a notion of verification complexity of a (real) prime ideal (in a prime cone) which gives a lower bound on the decision complexity. We exactly determine the verification complexity of some prime ideals of linear type generalizing a result by Winograd (1970). As an application we show uniform optimality with respect to the number of multiplications and divisions needed for two algorithms: For deciding whether a number is a zero of several polynomials - if this number and the coefficients of these polynomials are given as input data - evaluation of each polynomial with Horner's rule and then testing the values for zero is optimal. For verifying that a vector satisfies a system of linear equations - given the vector and the coefficients of the system as input data - the natural algorithm is optimal. |