# A book of curves by E. H. Lockwood

By E. H. Lockwood

This booklet opens up an incredible box of arithmetic at an user-friendly point, one within which the portion of aesthetic excitement, either within the shapes of the curves and of their mathematical relationships, is dominant. This publication describes tools of drawing aircraft curves, starting with conic sections (parabola, ellipse and hyperbola), and happening to cycloidal curves, spirals, glissettes, pedal curves, strophoids etc. usually, 'envelope tools' are used. There are twenty-five full-page plates and over 90 smaller diagrams within the textual content. The booklet can be utilized in colleges, yet may also be a reference for draughtsmen and mechanical engineers. As a textual content on complex airplane geometry it may attract natural mathematicians with an curiosity in geometry, and to scholars for whom Euclidean geometry isn't a crucial examine.

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**Example text**

Top. , 4, 315–339. [1974b] On the existence of non-metrizable hereditarily Lindel¨of spaces with point-countable bases. Duke Math. , 41, 299–304. [1974c] On the existence of normal metacompact Moore spaces which are not metrizable. Can. J. , 26, 1–6. [1976a] The density topology. Pac. J. , 62, 175–184. [1976b] Stalking the Souslin tree - a topological guide. Canad. Math. , 19, 337–341. [1976c] Weakly collectionwise Hausdorﬀ spaces. Top. , 1, 295–304. [1977a] First countable spaces with calibre ℵ1 may or may not be separable.

Rst countable spaces are ℵ1 -collectionwise Hausdorﬀ ? This question is just something that I expected would have a positive answer but couldn’t make any headway on. Shelah [1979] showed that ♦∗ implies that normal ﬁrst countable spaces are ℵ1 -collectionwise Hausdorﬀ and every other separation theorem which used normality eventually was extended to countable paracompactness (see Watson [1985] and Burke’s use of PMEA). The real question here is vague: “is there a distinction between the separation properties of normality and countable paracompactness”.

One expects ﬁrst countability to be a big help but so far it seems useless in this context. The drawback to this question is that if the answer is no, one ﬁrst has to solve the set-theoretic question and then ﬁgure out how to lower the character from the continuum to ℵ0 . Getting the character down is always interesting. On the other hand, if there is a theorem, that might involve a hard look at the weak version of ♦ invented by Keith Devlin (Devlin and Shelah [1978]) and lots of people would be interested in an essential use of that axiom.