Cantor used it to prove that there are exactly as many positive fractions (ratios p/q of positive whole numbers p and q) as there are natural numbers (1, 2, 3, 4, …).

康托用此论题来证明有多少自然数（1，2，3，4，…），就有多少正分数（正整数p和q的比率p/q）。

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Ticket Validity: 5 days. Booking Class: Q, not eligible for FFP Mileage Accrual.

机票有效期：5天，机票级别代号为Q，不可累积飞行哩数。

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