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A City is Not a Tree

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Originally published in: Architectural Forum, Vol 122, No 1, April 1965, pp 58-62 (Part I), Vol 122, No 2, May 1965, pp 58-62 (Part II)

A City is Not a Tree By Christopher Alexander Originally published in: Architectural Forum, Vol 122, No 1, April 1965, pp 58-62 (Part I), Vol 122, No 2, May 1965, pp 58-62 (Part II) Part I The tree of my title is not a green tree with leaves. It is the name of an abstract structure. I shall contrast it with another, more complex abstract structure called a semilattice. In order to relate these abstract structures to the nature of the city, I must first make a simple distinction. I want to call those cities which have arisen more or less spontaneously over many, many years natural cities. And I

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