MIT, Library!
Ivy Li looked at the paper published by Ye Feixin.
"Condition (H4) is equivalent to b(0)?N={1,2,3,...}, and it will be seen that condition (H4) is the only necessary condition for the existence of a solution of the formal power series..."
"Power series solution, power series solution..." Ivy Li murmured to herself, her beautiful eyes becoming brighter and brighter like stars.
"Yes!" She suddenly clenched her fist excitedly and waved her fist, saying, "That's how it's solved."
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