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controlled-reduction

Build Status

PyPI package

For a PyPI package that integrates most of controlled-reduction into SageMath, see pycontrolledreduction.

Abstract

An implementation of the controlled reduction method for computing the Hasse-Weil zeta functions of smooth projective hypersurfaces over finite fields. Explicitly, by computing a p-adic approximation of Frobenius action on p-adic cohomology (Monsky-Washnizter) with sufficient precision and then lifting its characteristic polynomial to the integers. An overview of the method can be found in:

  • "Computing zeta functions of nondegenerate projective hypersurfaces over finite fields", (under preparation) by Edgar Costa and David Harvey.
  • "Effective computations of Hasse-Weil zeta functions", by Edgar Costa

Dependencies

It majorly depends on:

Which depend on:

However, SageMath comes with all this libraries.

Installation

There are 3 options:

Using SageMath to provide the dependencies

  1. Figuring out where SageMath is installed. We recommend doing this and storing in an environmental variable by doing:
SAGE_ROOT=$(sage -c "print SAGE_ROOT")

Alternatively, in Sage do print SAGE_ROOT and on the unix terminal: SAGE_ROOT=<the line printed in Sage>

  1. Download controlled reduction
git clone https://github.com/edgarcosta/controlledreduction.git
  1. Change your working directory and run the configure file
cd controlledreduction && ./configure --with-ntl=$SAGE_ROOT/local
  1. Compile everything by doing
make
  1. Set up the variable $LD_LIBRARY_PATH, so the executables can find the libraries at run time. One can do this for the current terminal by doing:
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$SAGE_ROOT/local/lib

and for this line to be ran at the start of every session one can do

echo export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$SAGE_ROOT/local/lib >> ~/.bashrc
  1. You can optionaly run some tests by doing
make check

or check out some of the examples

build/examples/K3_dwork

Manually specifying the path for the dependencies

  1. make sure you have the dependencies (see the source of the script build_dependencies if you would prefer to build them manually), if they are installed in a non-standard path, be sure to set $LD_LIBRARY_PATH accordingly.

  2. ./configure to generate the makefile.

    To link against the libaries by SageMath it should be sufficient to run ./configure --with-ntl=<SAGE_DIR>/local/.

    Run ./configure --help for more options.

  3. make to build everything

  4. make check to run some tests.

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An implementation of the controlled reduction method for computing the Hasse-Weil zeta functions of smooth projective hypersurfaces over finite fields

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