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Date:      Thu, 27 Dec 2001 09:55:00 -0600
From:      Andy Isaacson <adi@hexapodia.org>
To:        Eric Yu <ericyu@mail2000.com.tw>, roam@FreeBSD.org
Cc:        freebsd-gnats-submit@FreeBSD.org, freebsd-bugs@FreeBSD.org
Subject:   Re: misc/33242: misspelling in primes.c
Message-ID:  <20011227095500.B8252@hexapodia.org>
In-Reply-To: <200112271309.fBRD9tT22279@freefall.freebsd.org>; from ericyu@mail2000.com.tw on Thu, Dec 27, 2001 at 05:09:55AM -0800
References:  <200112271334.fBRDYvk32416@freefall.freebsd.org> <200112271309.fBRD9tT22279@freefall.freebsd.org>

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On Thu, Dec 27, 2001 at 05:09:55AM -0800, Eric Yu wrote:
> On src/games/primes/primes.c, line 85, "if and onl if".
> 
> >How-To-Repeat:
> In the file.
> 
> >Fix:
> - * sieve, table[i] == 1 if and only iff 2*i-1 is prime.
> + * sieve, table[i] == 1 if and only if 2*i-1 is prime.

To a mathematician, the phrase "table[i] == 1 iff 2*i-1 is prime" is
equivalent to "table[i] == 1 if and only if 2*i-1 is prime".  That is,
"iff" is a neologism for "if and only if".  So it is not a misspelling,
but a redundancy. :)

-andy

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