The undecidable : basic papers on undecidable propositions, unsolvable probl...

Little Convent in the Big City: The Unsolvable Problem

Gentle Propositions - Paperback By Economos, J S - VERY GOOD

Little Convent in the Big City: The Unsolvable Problem

On Certainty: Wittgenstein on Knowledge, Propositions, and Common Sense―Inspired

The Peace Promise: Trusting God to Solve the Unsolvable, John Kuypers, New Book

The Peace Promise: Trusting God to Solve the Unsolvable - Hardcover - VERY GOOD

Gentle Propositions, Economos, J S