Word: matrixes
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Dates: during 1930-1939
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...Physics.' " Werner Heisenberg at 21 had distinguished himself by studies on the Zeeman effect (splitting of spectrum lines when light comes from an electromagnetic field). Independently of the de Broglie wave mechanics, he devised an abstruse mathematical description of electronic behavior which he called "matrix mechanics." He saw the necessity of a wave concept as well as anyone else, but he followed the Newtonian principle that hypotheses should be avoided. In the light of wave mechanics alone, electrons lost their individualities, melted into a continuous field of negative electricity. But there was strong experimental evidence of "discontinuity," of individuality...
Wave mechanics and matrix mechanics are different mathematical expressions of the same theory. A third description of electron behavior, which strengthened rather than contradicted the other two representations, was contributed by last week's third prizewinner, Cambridge University's brilliant young Dr. Dirac. Also, long before lightweight protons or "positrons" were experimentally observed by Caltech's Dr. Carl David Anderson (TIME, March 6), Dr. Dirac had declared such particles to be required by mathematical necessity. But this shy, angular youngster with small Wack eyes and small black mustache, already a big frog in the subatomic puddle, made...
...speck of white in the prevailing red of the desert sufficed to indicate a partially exposed fossil. After a little practice the men spotted digging sites with field glasses. Having discovered a fossil, the diggers used whisk brooms and needles to disengage the item from its matrix. Dr. Andrews was usually chased away from a find. Impetuous, he was apt to use a pickaxe...
...inch on each side, was removed (from the back) for biopsy. . . . The removal of this tissue was comparable to the removal of a section from a block of wood. . . . Indeed, the removed triangle of tissue could be fitted back into the defect as accurately as if it were a matrix." What ailed Albino P. P. is any pathologist's opinion. First, tentative diagnosis was cancer. Drs. Fischel & Jorstad believe that P. P.'s lump was one vast, complicated sear, result of the sore on his neck...
...well with Indians and has written a book about them.* The elder Nusbaum likes to go picking into dirty old caves, and if he finds a bit of painted pottery or a woven basket he is as happy as if he had found a chunk of turquoise in a matrix of silver. He docs not go nosing into an Indian's private affairs. If he happens to see a flask of harmless whiskey, he may tell the fellow to throw it away. But he will not have him arrested. One can trust...