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RT Book, Whole SR Print DC OPAC T1 Every planar map is four colorable / Kenneth Appel and Wolfgang Haken T2 Contemporary mathematics A1 Appel, Kenneth I., 1932- A1 Haken, W. (Wolfgang) YR 1989 FD c1989 SP xv, 741 p. K1 Four-color problem PB American Mathematical Society PP Providence, R.I. SN 0821851039 LA English (英語) CL LCC:QA612.18 CL DC20:511/.5 CL NDC8:410.9 NO 書誌ID=1000357122; NCID=BA07740122; LK [OPAC]https://www.lib.sophia.ac.jp/opac/opac_link/bibid/1000357122 OL 30