Mathematical symbols in title spelled out.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
3 [towards infinity] : new multiple art, [catalogue of an exhibition] at the Whitechapel Art Gallery, London E.1., 19 November 1970-3 January 1971 by Arts Council of Great Britain. ISBN 0900085339. Published by Arts Council in 1970. Publication and catalogue information, links to buy online and reader comments.
![3 [towards infinity] : new multiple art, [catalogue of an exhibition] at the Whitechapel Art Gallery, London E.1., 19 November 1970-3 January 1971](http://ecx.images-amazon.com/images/I/51BEajwXAKL._SL160_.jpg)