id: 06080394 dt: a an: 06080394 au: de Freitas, Renata; Viana, Petrucio ti: A graph calculus for proving intuitionistic relation algebraic equations. so: Cox, Philip (ed.) et al., Diagrammatic representation and inference. 7th international conference, Diagrams 2012, Canterbury, UK, July 2‒6, 2012. Proceedings. Berlin: Springer (ISBN 978-3-642-31222-9/pbk). Lecture Notes in Computer Science 7352. Lecture Notes in Artificial Intelligence, 324-326 (2012). py: 2012 pu: Berlin: Springer la: EN cc: ut: proofs with graphs; relation algebra; intuitionistic logic ci: li: doi:10.1007/978-3-642-31223-6_40 ab: Summary: In this work, we present a diagrammatic system in which diagrams based on graphs represent binary relations and reasoning on binary relations is performed by transformations on diagrams. We proved that if a diagram $D _{1}$ can be transformed into a diagram $D _{2}$ using the rules of our system, under a set $Σ$ of hypotheses, then it is intuitionistically true that the relation defined by diagram $D _{1}$ is a sub-relation of the one defined by diagram $D _{2}$, under the hypotheses in $Σ$. rv: