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题目材料：
In his history of algebra, John Derbyshire asserts that when Descartes chose the letter X to represent the principal unknown, he did so for the printer' s convenience, because X is used less often in French than Y or Z. In fact, according to cryptography texts, X is used more often than Y in French. Derbyshire's source for his assertion is Classic Math, whose author, Art Johnson, gives no footnote for the claim but who may have misunderstood a conjecture made in 1905 - almost 300 years after Descartes - by Gustav Eneström and mentioned in a book included in Johnson' s Bibliography. Eneström supposed that X was chosen because it occurs more often than Y and Z, and printers therefore would have had more X's available.
以上解析由 考满分老师提供。
