Byoung Keum
 Dept. of Math.
 Univ. of IL. Urbana


               Differential Equations and Calculus V. 7.
               ============ ========= === ==============

        This update fixes the bug in my formula interpretor (nested
 '-' signs ), and contains a new program euler.com:

        1. There was a minor bug in my old parser: -x-y was interpreted
            as -(x-y) (in view of the simplified recursion scheme). 
            It is cmpletely fixed now.

        2. I recently developed a new parser (written in Microsoft
           Quick C), which is so optimized as to be included in a
          large loop.

        3. Compare euler.exe (New parser written in C) with ODE option
           in de.com (old parser written in Pascal ).
           
           Although their mathematical algorithms are similar,
           you will be marveled at the speed of euler.exe. 
           ( I tested it on IBM AT (640K, 8087, EGA), and found that
             euler.exe performed about ten times faster. )

        4. For this speed, euler.exe needs loots of memory (binary trees,
           recursion).  I only tested it with 640 K RAM.  (Probably it will
           work with less. )
      

        SYSTEM   REQUIREMENT
        ======   ===========
        All these require EGA.
        CALC7.COM and DE7.COM require 8087 Math Coprocessor.


        REGISTER BENEFIT
        ======== =======

         I want to put this disk in shareware library.
         For those who register ( $30.00 would be reasonable ), I will
         provide a customized version for their need, and the source
         code for new parser (extremely fast, but large memory) and
         old parser (uses less memory).  And, some documents will be
         provided.