If it's right to modify the paper, it's clear to me that !4 should read
4! in http://www.jsoftware.com/papers/algebra.htm
4. The symbol for a function of one argument sometimes occurs
before the argument (as in -4) but may also occur after it (as in !4 for
factorial 4) or on both sides (as in |X| for absolute value of X).
Date: Wed, 28 May 2014 01:39:07 -0700
From: Roger Hui <[email protected]>
To: Chat Forum <[email protected]>
Subject: Re: [Jchat] "Common Core"
Message-ID:
<camz_i_arrkgsyexxyrntrsqzlzwls++nbdcumchjin4yndy...@mail.gmail.com>
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See: *Algebra as a Language* <http://www.jsoftware.com/papers/algebra.htm>
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