Strict colourings of images and uncolourable images Original Research Article

Strict colourings of STS(3v)STS(3v)s containing three mutually disjoint subsystems of order vv are examined. An upper bound for View the MathML sourceχ¯ of STS(3v)STS(3v) linked with View the MathML sourceχ¯ of its subsystems of order vv is determined and an infinite class of uncolourable BSTS(3v)BSTS(3v)s is found.