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   Carstensen, A.; Kim, M.; Kim, G.; Jin, M.; Kang, M.; Choi, Y.; & Walker C.M. (January 2023, Proceedings of the Annual Conference of the Cognitive Science Society)
2. Three Impossible Theories

   Susskind, Leonard (June 2021, ArXivorg)

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3. Understanding how context impacts teacher learning: Three PDs and three sites.

   Koellner, K. (January 2021, Proceedings of the 42nd Annual Psychology of Mathematics Education North America.)

   M. Inprasita, N. Changsri (Ed.)

   The study presented here utilized a cross case comparison of three different professional development programs to examine the contextual factors associated with uptake related to what teachers learned related to content, pedagogy and the resources used in their professional development (PD) workshops. From a theoretical perspective this study draws on a situative perspective to guide our analyses on how uptake across different PD projects located in different geographical contexts impacted teacher learning. Findings indicate that teachers’ perceptions of learning may be associated with explicit goals and intentions of the PD program and the relevance to their everyday work in mathematics classrooms. Differences were found to be related to where they fell on the adaptive-specified continuum. 

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4. Three-mirror freeform imagers

   https://doi.org/10.1117/12.2314403  

   Papa, Jonathan C.; Howard, Joseph M.; Rolland, Jannick P.; Mazuray, Laurent; Wartmann, Rolf; Wood, Andrew P. (June 2018, SPIE Optical Systems Design VII)

   Driven by the development of freeform imaging systems, we have combined several concepts and techniques from the literature to analytically generate unobscured freeform starting point designs that are corrected through the third-order image degrading aberrations. The surfaces used in these starting point designs are described as a base off-axis conic that images stigmatically for the central field point, also known as a Cartesian reflector, with an aspheric departure “cap” (quartic with the aperture) added to the base off-axis conic to correct for the third-order image degrading aberrations. Once the aspheric caps are added to the surfaces, the system is then optimized using higher order freeform terms while leaving second-order terms frozen to preserve the focal length of the system during optimization. This technique is used to survey the three-mirror freeform imager solution space. Several systems that are the result of this technique are shown, with different numbers of internal images, internal pupil conjugates and folding geometries. 

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5. Three-phase Transformer Modeling

   https://doi.org/10.1109/Allerton58177.2023.10313400  

   Low, Steven H. (September 2023, 2023 59th Annual Allerton Conference on Communication, Control, and Computing (Allerton))