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A relation is often considered to be a more general case of a property

I don't fully understand. Is it to say a relation is a case of a property ? then what's a more general case?

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From an article in Wikipedia –  RedGrittyBrick Feb 2 '11 at 22:59
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I believe it means that a relation is a property lacking strictness, loosely defined. But it's just a guess. I have no proof and I am not a native either.

For example, if you say that "A is taller than B", A has the property of being taller than B, but you do not know exactly how tall A is, because this is dependent on B.

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I think it becomes clearer when stated the other way around: "A property is a more specific type of relation." In other words, a relation is a general-purpose category of items, like "vehicle"; a property is a specific type of relation, like "car" is a type of vehicle. All cars are vehicles, and all properties are relations; but not all vehicles are cars, and not all relations are properties.

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Here, property > relation : [ For generality we will also take properties to include relations like being taller than and lying between](plato.stanford.edu/entries/properties). I'm confused. –  user3780 Feb 3 '11 at 1:22
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The sentence refers to the word general as in less specific. An item can have measurable properties while relating to other items through comparisons.

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