Rhyd-y-foel
(mathematics, logic) A decision problem of finding a way to decide whether a formula is true or provable within a given system.
A small village in Llanddulas and Rhyd-y-foel community, Conwy county borough, Wales (OS grid ref SH9176).
plural of Perezperez
(photography, dated) A camera in which a number of plates can be exposed without reloading.
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