A rational number 𝑎/𝑏 is greater than 𝑐/𝑑 if (for all positive 𝑎,𝑏,𝑐,𝑑)
A rational number 𝑎𝑏 is greater than 𝑐𝑑 if (for all positive 𝑎,𝑏,𝑐,𝑑)