58312
In general , finite difference methods are used to price options by approximating the ( continuous-time ) differential equation that describes how an option price evolves over time by a set of ( discrete-time ) difference equations .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None