question: How did Alexander Macfarlane summarize the relationship between different methods in `` A Treatise on Algebra '' in his review ?
answer: comparative study of their several structures
turker_answer: Alexander Macfarlane summarized the relationship between different methods in `` A Treatise on Algebra '' as a comparative study of their several structures .
rule-based: Alexander Macfarlane summarized the relationship between different methods in `` A Treatise on Algebra '' in his review by comparative study of their several structures .