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# What Codd once said...

Posted on 2015-02-03

Qoute:

... notice the term distinct—a **set has no duplicates**. Codd once remarked on the **no duplicates aspect**: ”If something is true, then saying it twice won't make it any truer.“ For example, the set {a, b, c} is **considered equal** to the set {a, a, b, c, c, c}.

My understanding: A set like set {a, b, c} is distinct

The above writing states: For example, the set {a, b, c} is **considered equal** to the set {a, a, b, c, c, c}.

My question: I see repeat elements in set {a, a, b, c, c, c}. more than one a. Also there are more than one c. How can we say this set is distinct?