Abstract
In the present paper we introduce the notion of a positive linear relation and we investigate the class of such operators. As well as placing the theory of positive operators in a natural setting, this structure seems to be interesting for the study of abstract boundary value problems.
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Ayadi, M., Baklouti, H. Positive linear relations between Riesz spaces. Positivity 20, 917–927 (2016). https://doi.org/10.1007/s11117-015-0393-x
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DOI: https://doi.org/10.1007/s11117-015-0393-x