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This digest episode features the following summaries (timecodes indicated):

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• (02:10) Thompson, P. W., Hatfield, N. J., Yoon, H., Joshua, S., & Byerley, C. (2017). Covariational reasoning among U.S. and South Korean secondary mathematics teachers. Journal of Mathematical Behavior, 48, 95\\u2013111. Summarized by Jeremy Strayer\\n
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• (08:28) Lobato, J., & Walters, C. D. (2017). A taxonomy of approaches to learning trajectories and progressions. In Cai, J. (Ed.), Compendium for research in mathematics education (pp. 74-101). Reston, VA: National Council of Teachers of Mathematics. Summarized by Kimberly Morrow-Leong\\n
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• (20:10) Polly, D., Wang, C., Martin, C., Lambert, R., Pugalee, D., & Middleton, C. (2018). The influence of mathematics professional development, school-level, and teacher-level variables on primary students\' mathematics achievement. Early Childhood Education Journal, 46, 31-45. Summarized by Sam Otten\\n
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