 Position Space Renormalization Group by Mehran Kardar

Author-hosted MIT course notes: Lecture 13, printed pp. 75–81 and Lecture 14, printed pp. 82–88. No revision date is inferred from the host's current course navigation.

Lecture 13, section V.B, equations V.13–V.27 develops exact one-dimensional spin decimation, its normalization and scaling variables. Lecture 14, section V.D, printed pp. 86–87, equations V.51–V.54 specifies bond moving followed by chain decimation. The official MIT 8.334 course page identifies Mehran Kardar as instructor.