INTRODUCTION This is a library for building and querying a compressed form of set-membership filters, named k-XORSAT filters. These filters can be used similar to how one would use a Bloom filter but with one restriction --- items cannot be added after the filter is built. So, this is an 'offline' or 'static' filter, whereas Bloom filters are considered 'online' or 'dynamic'. The advantage is that k-XORSAT filters achieve very near the optimal memory usage. That is, they use much less memory tha...