The Bay Area Circle for Teachers (BACT) endeavors to support teachers learning, enhancing and sharing content knowledge and instructional practices that bring such rich mathematical exploration into our schools. Currently we facilitate two workshops, a day-long winter workshop and a week long summer workshop that gives teachers experience with and resources from some of the wealth of math circle lessons currently being led in many math circles both local and national. We are continually looking to understand teacher's needs, to facilitate their interaction with research and applied mathematicians, and to support their development as math educators.
Imagine a math classroom where students willingly engage on collaborative exploration and problem-solving of rigorous mathematical concepts. Now imagine that students broaden their understanding of what mathematics is, and while doing so develop problem-solving strategies that may be applied in any area of mathematical challenge. Imagine mathematics instruction that is in its nature engaging and often fun and students participate of their own free will.

A good math circle lesson does just this. It involves exploring mathematical concepts or problems in such a way that most students can engage and be challenged yet which have no ceiling to where this exploration takes them. It respects and extends student thinking. It provides them with models and approaches to develop their own observations. It promotes the role of student to that of budding mathematician capable of investigation and expression of critical thinking. And while doing so, it exposes students to the variety, complexity, and perhaps beauty of mathematics itself.
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 BACT Resource Library
BACT Summer Workshop
40+ participants, instructors, organizers and helpers are engaging in enticing mathematics, developing resources and community, and enjoying the company of like-minded educators.
Bay Area Circle for Teachers Facebook Group
Find more detailed workshop information here including session handouts and other resources.

Click Here for more information about past Bay Area Circle for Teachers Summer Workshops!
The Summer workshop supports teachers in their development of problem solving skills as well as the incorporation of problem solving into their school’s curriculum. During the earlier part of the week teachers will gain experience with a variety of problem solving techniques such as symmetry, mathematical patterns, and parity. Subsequent sessions will focus on particular topics such as geometry, sequences, counting, and number theory. Traditionally relegated to the high school curriculum or beyond, these topics actually provide a natural starting point for exploring and appreciating interesting mathematics at the middle school level. All the sessions will be led by exceptional educators and mathematicians from the San Francisco Bay area. The participants will be provided with housing, supplies, and meals for each day of the workshop they attend. Applications will be evaluated on a first-come first-served basis beginning late February, 2013 and spaces will fill up fast, so please apply early!

Notes from the Winter Workshop , Saturday, January 26, 2013
a warm and sunny day in Jack London Square. 

Henri Picciotto introduced Function Diagrams , an alternate representation of functions which lends itself to observing the input and output, and visualizing composition of functions.  
Here are Henri's session materials (and much more!):

The main function diagram page func-diag/       
handout: func-diag/pdfs/
presentation slides, the applets, etc.: a>
Graduate students from the CM^2 program at SFSU presented mini-versions of lessons they developed for their partner teacher classrooms.
Steven Collazos An Approach to Introducing Ehrhart Theory in High-School Algebra Paper
Alyssa Palfreyman Adjacencies in Three-Dimensional Graphs Paper
Brian Cruz Supercoiling: Linking Number, Twist, and Writhe Paper
Jack Love Polytopes and their Maps Paper
Jessica Delgado Math Circle Lesson Bowling Pin Puzzle Paper
Kelley Walker Down The Rabbit Hole Paper
Cecilia Maria Coca Normal Distributions Paper
Servando Pineda Random Walks on Polytopes Paper
Tahir Anjum Parity

Oakland/East Bay Teacher's Circle redesign and modified logo by Mathematical Sciences Research Institute (MSRI)