fvn is a Fortran95 mathematical library/module. It provides various usefull subroutine covering linear algebra, numerical integration, least square polynomial, spline interpolation, zero finding, special functions etc. Most of the work for linear algebra is done by interfacing Lapack http://www.netlib.org/lapack which means that Lapack and Blas http://www.netlib.org/blas must be available on your system for linking fvn. If you use an AMD microprocessor, the good idea is to use ACML ( AMD Core Math Library http://developer.amd.com/acml.jsp which contains an optimized Blas/Lapack. fvn include some integrated libraries : integration tasks uses a slightly modified version of Quadpack http://www.netlib.org/quadpack, the fnlib library http://www.netlib.org/fn is used for special functions and sparse system resolution uses SuiteSparse http://www.cise.ufl.edu/research/sparse/SuiteSparse/. This library has been initially written for the use of the "Acoustic and microsonic" group leaded by Sylvain Ballandras in the Time and Frequency Department of institute Femto-ST \url{http://www.femto-st.fr/. fvn License: Your use or distribution of fvn or any modified version of fvn implies that you agree to this License. This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Permission is hereby granted to use or copy this program under the terms of the GNU LGPL, provided that the Copyright, this License, and the Availability of the original version is retained on all copies. User documentation of any code that uses this code or any modified version of this code must cite the Copyright, this License, the Availability note, and "Used by permission." Permission to modify the code and to distribute modified code is granted, provided the Copyright, this License, and the Availability note are retained, and a notice that the code was modified is included.