Perhaps you should try some spelling variations:
"parabolic differential equation" » "partial differential equation", "parabolic differential equations"
"parabolic difference equations" » "metabolic differences equations", "analytic difference equations", "parabolic differential equations"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"parabolic differential equation\") OR (\"parabolic difference equations\"))".
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