###Instruction: Multi-class classification, answer with one of the labels:['no_consensus', 'delete', 'keep', 'comment', 'merge', 'redirect'] : ###Input:  Q8195050: self-adjoint operator (Q8195050) : densely defined operator on a Hilbert space whose domain coincides with that of its adjoint and which equals its adjoint; symmetric operator whose adjoint's domain equals its own domain : ( delete | history | links | entity usage | logs ) Merged with Q6500908 . Quickbaster ( talk ) 12:28, 6 March 2014 (UTC) [ reply ]