Abstract
We present the singularity analysis of the ultradiscrete analogue of linearisable mappings of Quispel-Roberts-Thompson (QRT) type. The ultradiscretisation method used here is one which keeps track of signs and thus can be applied without the positivity restrictions of the classical ultradiscretisation approach. We show that in all cases the mappings possess confined singularities. The same is true for two non-autonomous equations, which are equally linearisable in the discrete case. We construct explicitly the solutions of the ultradiscrete mappings analysed here.
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