Research was supported by the European Union and the State of Hungary, co-financed by the European Social Fund in the framework of TÁMOP 4.2.4. A/2-11-1-2012-0001 'National Excellence Program'.
Saturday, April 26, 2014
PCP -- undecidability on four tiles?
Hey, someone please check this.
Claims to have shown PCP is already undecidable for FOUR tiles.
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