Linearly definable classes of Boolean functions
          Couceiro, Miguel; Lehtonen, Erkko  
          
          Proceedings of the 1st International Conference on Algebras, Graphs and Ordered Sets (ALGOS 2020),  (2020), 39–46  
          http://hal.archives-ouvertes.fr/hal-02918958  
           
          In this paper we address the question "How many properties of Boolean functions can be defined by means of linear equations?" It follows from a result by Sparks that there are countably many such linearly definable classes of Boolean functions. In this paper, we refine this result by completely describing these classes. This work is tightly related with the theory of function minors and stable classes, a topic that has been widely investigated in recent years by several authors including Maurice Pouzet.  
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