 | George Boole - 1854 - 442 pagina’s
...representing things as subjects of our conceptions. 2nd. Signs of operation, as+,—, x , standing for those operations of the mind by which the conceptions of...differing from the laws of the corresponding symbols in the science of Algebra. Let it be assumed as a criterion of the true elements of rational discourse,... | |
 | Robert Gordon Latham - 1856 - 308 pagina’s
...things as subjects of our conceptions. " 2nd. Signs of operation, as +, — , X , standing for those operations of the mind by which the conceptions of...involving the sam.e elements. " 3rd. The sign of identity =. ****** " CLASS I. " Appellative or Descriptive Signs, expressing either the Name of a Thing, or... | |
 | Robert Gordon Latham - 1856 - 324 pagina’s
...things as subjects of our conceptions. " 2nd. Signs of operation, as +, —, x, standing for those operations of the mind by which the conceptions of...involving the same elements. " 3rd. The sign of identity ==. ****** " CLASS I. " Appellative or Descriptive Signs, expressing either the Name of a Thing, or... | |
 | South Kensington Museum - 1857 - 772 pagina’s
...represent things as subjects of our conceptions; the characters +, — , x, arc used as signs of operation by which the conceptions of things are combined or...resolved, so as to form new conceptions involving the sanie elements. The sign = indicates identity, and the laws of thought are expressed by equations.... | |
 | 1865 - 496 pagina’s
...conceptions ; the signs +, — , X, are employed as marks of those operations of mind by which our conceptions of things are combined or resolved so...form new conceptions involving the same elements. The sign = indicates identity, and the laws of thought are expressed by equations. The laws of these... | |
 | 1865 - 980 pagina’s
...signs +> — , X, are employed as marks of those operations of mind It/ which our conceptions of Hangs are combined or resolved so as to form new conceptions involving the same elements. The sign = indicates identity, and the laws of thought are expressed by equations. The laws of these... | |
 | Alexander Bain - 1870 - 304 pagina’s
...be represented by x + y. Third. The sign of identity = . These symbols of Logic are used according to definite laws, partly agreeing with, and partly...differing from, the laws of the corresponding symbols in the science of Algebra. The first class of symbols above given are the appellative or descriptive signs,... | |
 | 1910 - 426 pagina’s
...representing thing» as objects of our conceptions. "2nd. Signs of operation, as +, —, x, standing for those operations of the mind by which the conceptions of...these symbols of Logic are in their use subject to dctinite laws partly agreeing with and partly differing from the laws of the corresponding symbols... | |
 | Alexander Macfarlane - 1916 - 162 pagina’s
...things as subjects of our conceptions; second, Signs of operation, as +, — , X, standing for those operations of the mind by which the conceptions of...form new conceptions involving the same elements; third, The sign of identity = ; not equality merely, but identity which involves equality. The symbols... | |
 | Alexander Macfarlane - 1916 - 160 pagina’s
...things as subjects of our conceptions; second, Signs of operation, as +, — , X , standing for those operations of the mind by which the conceptions of...form new conceptions involving the same elements; third, The sign of identity = ; not equality merely, but identity which involves equality. The symbols... | |
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... 1st. Literal symbols, as x, y, drc., representing things as subjects of our conceptions. 2nd. Signs of operation, as + , — , X , standing for those operations of the mind by which the conceptions of things are combined or resolved so as to form... 
