# Farkas lemma

### From Glossary

This result gives an alternative system, of which there are many. Farakas' Lemma states that exactly one of the following is consistent,

**exclusive or**) .

An often used variant is

**exclusive or**) .

This result gives an alternative system, of which there are many. Farakas' Lemma states that exactly one of the following is consistent,

An often used variant is