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Theudius, 124

Thompson, D'Arcy W., 37
Thymaridas, Epanthema of, 114-116
"Triple-equations" of Fermat, 163 .,
179 m., 182 m., 2011., 223 n., 224 N.,
246, 321-328

“Units” (μováĉes)=absolute term, 39-40;
abbreviation for, 39, 130
Unknown quantity (=x), called in Dio-
phantus dpubs, "number": definition
of, 32, 115, 130; symbol for, 32-37,
130; signs for powers of, 38, 129;
signs for submultiples of unknown and
powers, 47, 130; Italian-Arabian and
Diophantine scales of powers, 40, 41;
Egyptian scale, 41; x first used by
Descartes, 50 n.; other signs for, used
by Bombelli, 22, 38, N (for Numerus)
by Xylander, Bachet, Fermat and others,
38, R (Radix or Res), 38, Radice, Lato,
Cosa, 40 n.

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Wallis, 40 m., 286, 287, 288, 289
Weber, Heinrich, 3 .

Weber and Wellstein, 107 n., 145 m.
Wertheim, 30, 110 n., 137 n., 138 n.,
145 m., 151 N., 161 m., 209 n., 211 n.,
212 n., 216 n., 217 n., 254 m., 256, 257,
286 n., 294, 295
Westermann, 125 n.
Widman, 49 n.
Wieferich, 145 n.
Woepcke, 5 n.

"Wurm's problem," 123

x for unknown quantity, originated `with
Descartes, 50 n.

Xylander, 17, 22-26, 27, 28, 29, 35, 38,
107-108 n., 140n.; Xylander's MS. of
Diophantus, 17, 25, 36

Zensus (=Censo), term for square of un-
known quantity, 38

Zetetica of Vieta, 27, 101, 285

Zeuthen, 118-121, 205 m., 278, 281 m.,
290, 294-295

CAMBRIDGE: PRINTED BY JOHN CLAY, M.A. AT THE UNIVERSITY PRESS.

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