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Science 8 September 1967:
Vol. 157. no. 3793, p. 1123
DOI: 10.1126/science.157.3793.1123
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Articles

College Math for 11-Years-Olds

Eugene H. Lehman Jr. 1

1 Department of Mathematics, Northern Michigan University, Marquette 49855

In my letter, "College math for 11-years-olds" (28 July), I stated that "it was apparent after a while that parabolas and hyperbolas could sometimes fall into circles and ellipses or vice versa." This is not true! Under any nonsingular linear transformation parabolas become parabolas, hyperbolas become hyperbolas, and ellipses become ellipses become ellipses (or circles).

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Science. ISSN 0036-8075 (print), 1095-9203 (online)