###Instruction: Multi-class classification, answer with one of the labels:['no_consensus', 'delete', 'keep', 'comment', 'merge', 'redirect'] : ###Input:  Q21526904: imaginary time (Q21526904) : Wick-rotated time coordinates in relativistic field theory : ( delete | history | links | entity usage | logs ) All linked articles have been deleted
-- DavidMar86hdf ( talk ) 15:49, 28 November 2015 (UTC)