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In mathematics and computer science , computer algebra , also called symbolic computation or algebraic computation is a scientific area that refers to the study and development of algorithm s and software for manipulating mathematical expressions and other mathematical object s. Although , properly speaking , computer algebra should be a subfield of scientific computing , they are generally considered as a distinct field because scientific computing is usually based on numerical computation with approximate floating point number s , while computer algebra emphasizes on exact computation with expressions containing variable s that have not any given value and are thus manipulated as symbols ( therefore the name of symbolic computation ) .
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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:
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