164 HILBERT, D PRINCIPLES OF MATHEMATICAL LOGIC / / BY D. HILBERT & W. ACKERMANN ; TR. FRON THE GERMAN BY L. N. HAMMOND, G.G. LECKIE & F. STEINHARDT ; EDITED WITH NOTES BY R. E. LUCE. - NEW YORK: : CHELSEA PUB. CO,, 1950. xii,172(8) P. : : $3.75 * MATHEMATICAL LOGIC.