"Fundamental theorems" could be core principles, essential theories, or basic laws. "Solution Methods" as Techniques, Approaches, or Strategies. "Separation of variables" is a term, but maybe split into synonyms for "separation" – parting, division, isolation. "Integrating factors" might be integrating elements, solution adjuncts, or differential multipliers.
Need to go through each word, check if it's a proper noun (like "Titas PDF") and leave it, then apply spintax to others. Also, need to ensure that the rewritten options are synonyms or related terms. For example, "used to model" could become "applied to simulate|employed to represent|utilized to create..." etc. Need to maintain the meaning but vary the words. ordinary differential equations titas pdf
Lastly, the "Software Tools for Solving ODEs" part: "There are several software tools available for solving ODEs, including: MATLAB". Since MATLAB is a proper noun, it stays. The rest: "There are several software tools available for solving ODEs, including: MATLAB". Wait, the user said proper nouns stay. So the software tools part only has "MATLAB" as a proper noun. No other tools mentioned. So the sentence remains as is but with spintax for the initial words. For example, "used to model" could become "applied
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