"Let x equal the quantity or quantities of x"

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Reading Eddie's poem "Country" reminded me of the following from the film Proof (2005), adapted from David Auburn's play (2001).  

Let X equal the quantity or quantities of X. Let X equal the cold. It is cold in December. The months of cold equal November through February. There are four months of cold, and four of heat, leaving four months of indeterminate temperature. In February it snows. In March the Lake is a lake of ice. In September the students come back and the bookstores are full. Let X equal the month of full bookstores. The number of books approaches infinity as the number of months of cold approaches four. I will never be as cold now as I will in the future. The future of cold is infinite. The future of heat is the future of cold. The bookstores are infinite and so are never full except in September...

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