. Contributions. In 7 there are one, an infinitenumber, or no solutions accor- A Fig. 7. .4, 1- C, ding as a^a , I -< ^^^ ^iin 8 there are two, one, ornone according as ds < Suppose next that p < «:the equation in T becomes Vi - y-2 dg G,. The different possibilities areshown in Figs. 9,10,11,12, results are as follows: Fig. 9, two solutions, one. or nom- according as co-a ^^-^. — cV- Fi^A 10, two solutions, one, or none according awds <C. o Fig. 9.

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Keywords: ., bookcentury1900, bookdecade1910, bookidcontribution, bookyear1915