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From: Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups: comp.lang.javascript
Subject: Re: passing a set of numbers to a function
Date: Fri, 29 Jan 2016 16:11:31 +0000
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John Harris <niam@jghnorth.org.uk.invalid> writes:

> On Fri, 29 Jan 2016 12:23:53 +0000, Ben Bacarisse
> <ben.usenet@bsb.me.uk> wrote:
>
>>John Harris <niam@jghnorth.org.uk.invalid> writes:
>>
>>> On Fri, 29 Jan 2016 10:09:17 +0000, Ben Bacarisse
>>> <ben.usenet@bsb.me.uk> wrote:
>>>
>>>   <snip>
>>>>Sets don't contain duplicates
>>>   <snip>
>>>
>>> How can you tell?
>>
>>x not in (S \ {x}).  |{x}| = 1.  x in S => |S \ {x}| = |S| - 1.  These
>>are inconsistent with my understanding of the metaphor of duplication
>>(though I accept it might have other nuances for other people).
>
> It depends what you mean by |{x}| = 1. Possibly you mean
>   a) x occurs only once in {x};
> or possibly you mean
>   b) x is a member of {x} but no other object is.

I intended the conventional meaning of cardinality.

<snip>
-- 
Ben.