On the Cardioids Fulfilling Certain Assigned Conditions
On the Cardioids Fulfilling Certain Assigned Conditions
Mary Gervase Kelley
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X, p. 44. ) PROBLEM (b) : The centre, a point and a line given. Take the origin as centre; z-\-z' = 2 as the given line and /> as the given point. The intersections of cusp-loci will, as before, give the number of solutions. The cusp-locus for cardioids with centre and touching z-\-z' = 2 is the circular cubic 27kk'(k-\-k')-5ikk'-\-S = 0; the cusp-locus for cardioids with centre and passing through p is the bicircular quartic Sk''k'^-6pp'kk'-^kk\kp'-\-k'p)-py^ = 0. These two curves have 12 comm...on intersections; i. E. , there should be 12 cardioids satisfying the required conditions. But, since Cardioids Fulfilling Certain Assigned Conditions 17 the two curves have 4 points in common at each of the circular points, there can be, at most, 4 real cardioids. However, there are not always 4 real. Therefore, let us determine the regions of the plane where there are 4, or only 2, or no real cardioids satis- fying the given conditions. The map equation of any cardioid with centre at is z = ^at-aT, Since 2+2' = 2 is to be tangent to this, z-Sat+Sa'f-z't^ -s+z'-^ Employing the value t= —1, we have for a, a\ any one of the 8 equations : 3a+3a/=-2 3aco+3aV=-2 3aco2+3a'a;=-2 It will be sufficient to take the first equation.
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