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OEF subspace definition

OEF subspace definition
--- Introduction ---

This module actually contains 21 exercises on the definition of
subspaces of vector spaces.
You are given a vector space and a subset defined in various ways;
up to you to determine whether the subset is a subspace.

Description: collection of exercices on the definition of subspace of vector spaces. This is the main site of WIMS (WWW Interactive Multipurpose Server): interactive exercises, online calculators and plotters, mathematical recreation and games