- Deduction, 11, 49.
- Deductive reasoning, 534;
- miscellaneous forms of, 60;
- probable, 209.
- Definition, 39, 62, 711, 723;
- purpose of, 54;
- of cause and power, 224.
- De Morgan, Augustus, negative terms, 14;
- Aristotle’s logic, 18;
- relatives, 23;
- logical universe, 43;
- complex propositions, 75;
- contraposition, 83;
- formal logic quoted, 101;
- error of his system, 117;
- anagram of his name, 128;
- numerically definite reasoning, 168–172;
- probability, 198;
- belief, 199;
- experiments in probability, 207;
- probable deductive arguments, 209–210;
- trisection of angle, 233;
- probability of inference, 259;
- arcual unit, 306;
- mathematical tables, 331;
- personal error, 348;
- average, 363;
- his works on probability, 394–395;
- apparent sequence, 409;
- sub-equality, 480;
- rule of approximation, 481;
- negative areas, 529;
- generalisation, 600;
- double algebra, 634;
- bibliography, 716;
- catalogues, 716;
- extensions of algebra, 758.
- Density, unit of, 316;
- of earth, 387;
- negative, 642.
- Descartes, vortices, 517;
- geometry, 632.
- Description, 62.
Table of Contents
INDEX.
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