The book Theory of Observations was written by author T N Thorvald Nicolai Thiele Here you can read free online of Theory of Observations book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Theory of Observations a good or bad book?
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. . -\- z[da X^] (GO) [pdX^] = x[ad X2] -\- . -\- z[dd X2], from which we determine the coefficients x . . . Z unambiguously. The number m of these equations is equal to the number of the unknown quantities, and they must be sufficient for the determination of the latter, because, according to a well known proposition from the theory of determinants, the determinant of the coefficients [aaXi], [dak^] [adk^], . . [ddki] = 2 dr, . . D, X^iOr) . . . X„(0s) is positive, being a sum of squares, and ...cannot be = 0, unless at least one of the func- tions [ao] . . . [do] could, contrary to our supposition, be represented as a function of the others. From the values of a; ... 2 thus found, we find likewise [p'o] = [po] — x[ao] — . . . — z[do]. (61) If [po] belongs to the partial system represented by [ao] .... [do], the de- termination of X . . . . Z expresses its coefficients in that system only, and then we get identically [p'o] = 0. 8 58 But if we take [po] out of the partial system, then (61) gives us [p'o] as different from zero and free of that partial system.
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