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I didn't see "Schaum's Outline of Calculus of Finite Differences and Difference Equations" in the list above, so perhaps the current offerings on their website don't match the full back catalog.
As it so happens, that volume is one which I am quite
familiar with as I studied it in the eighth grade when I
was teaching myself calculus. I picked it up at a local
used bookstore, where I also found other math books.
I would be quite happy if PM could wind up serving a
similar role to that bookstore for eighth graders who
are interested in learning math.
As a rough measure of feature parity, let us consider
each section as equivalent to an encyclopaedia
entry. That particular value has 97 sections and 877
problems, 420 of which come with full solutions.
Assuming all the books are of roughly the same size,
that comes out to something like 6000 encyclopaedia
entries and 60000 problems with 20000 solutions. The
number of entries is something like half the number we
currently have; however, I think we would have to add
a few thousand entries to be really comparable, since
our coverage in most areas is spotty.
The quickest way to achieve this goal would be by
the books project since we can enter old textbooks which
cover the same material and have problems. In order
to get the solutions to the problems there in a reasonable
time, we will need to get to the point where we have 60
solutions per day coming in.
If we could recycle the encyclopedia, we'd be OK! -- we'd want to add about 5 problems per (current) encyclopedia article. That sounds like a lot of work, but an interesting project nonetheless.
This might go someplace on the Books project roadmap, see #37.
The outline of outlines is as follows:
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