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Book Certification
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1. To certify books, execute the following:

make ACL2=<Path of the ACL2 image>

If you already set up an environment variable ACL2 on your machine,
just simply run "make" to certify books. Here is how I set up this
variable.

* On Linux, add the following command to .cshrc:

  setenv ACL2 <Path to the ACL2 directory>/saved_acl2

* On Mac, add the following command to .bash_profile:

  export ACL2=<Path to the ACL2 directory>/saved_acl2

2. To remove certificate files, etc., execute the following:

make clean ACL2=<Path of the ACL2 image>

Or just "make clean" if you already set up the ACL2 environment
variable described above.

See Makefile for the detail.

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Book Organization
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arith-utils.lisp: Arithmetic utilities

rtl-utils.lisp: RTL utilities
