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Radford discusses in his article algebraic thinking and how students use signs with meanings in algebraic generalization of problems and also students' developing algebraic thinking. The author also examines different signs and their meanings then further discusses how these meanings affect students and their developing algebraic thinking. He also goes over different classroom discussions that took place regarding algebraic thinking. This article has many important points about the development of mathematical thinking but would not be excessively useful to analyze subject based thinking.