Harry,
You have no idea what you are talking about. All discussion here is related to mathematics. John's definition is correct and complete in mathematical sense.
Daniel Liu
Once a great philosopher crossing a river by a boat. Halfway he asked the boat operator 'Do you know mathematics?'. 'No, I don't'. 'Then you lost half of your life.' The philosopher asked again 'Do you know philosophy?' 'No, I don't.' You lost the other half of your life.' At this moment a big wave came and filled the boat with water. It began to sink. The boat operator asked 'Do you know how to swim?' 'No, I don't.' 'You are going to lose your whole life.'
Chinese proverb:
'A scholar cannot win an arguement with a soldier even he is correct.' :)
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