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A Single's Guide to Dating in Vienna
| The Dialogue Journal- Part
With the September opening of the 4. Since , million euros have been invested annually in the extension of the Vienna U-Bahn. The modern U-Bahn opened on 25 February   after test operations began on 8 May , but two of the lines extended and later designated as U-Bahn U4, U6 date back to the Stadtbahn "city railway" system, which opened in Parts of the U2 and U6 lines began as subway tunnels built to accommodate earlier tram lines. Only the U1 and U3 were built wholly as new subway lines.
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He is widely known for his Incompleteness Theorems, which are among the handful of landmark theorems in twentieth century mathematics, but his work touched every field of mathematical logic, if it was not in most cases their original stimulus. On the basis of that viewpoint he laid the foundation for the program of conceptual analysis within set theory see below. After publishing his dissertation in , he published his groundbreaking incompleteness theorems in , on the basis of which he was granted his Habilitation in and a Privatdozentur at the University of Vienna in Other publications of the s include those on the decision problem for the predicate calculus, on the length of proofs, and on differential and projective geometry. See Sigmund