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Dyfyniad Arddull ChicagoCunningham, Daniel W. Logical Introduction to Proof. New York: Springer, 2012.
Dyfyniad MLACunningham, Daniel W. Logical Introduction to Proof. Springer, 2012.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.