Mathematics

13. The Free Play of the Mind /452 end p. 511. 59 pages.

**✨ Join Us at Peter Chang in Herndon!** Join your DTs friends and family for an unforgettable Szechuan dinner at Peter Chang, located at 2322 Silver Arrow Wy, Herndon, VA 20171. It’s time to stop dreaming about spice and start living it. Join us at the legendary Peter Chang in Herndon for dazzling, nuanced, and seriously addictive Szechuan cuisine. If you're ready for the málà (numbing and spicy) sensation that defines the region, this is your pilgrimage. We're going to feast on signature dishes like their famous soup dumplings, spectacular Scallion Bubble Pancake, rich Dry-Fried Eggplant, Mongolian beef, and whatever other authentic, flavorful masterpieces we can fit on the table. Every Thursday is a new flavor with DTs. Come find yours! [https://peterchangherndon.com/](https://peterchangherndon.com/?fbclid=IwZXh0bgNhZW0CMTAAYnJpZBExQ003SHljZzMwT1ZHQjU1YnNydGMGYXBwX2lkEDIyMjAzOTE3ODgyMDA4OTIIY2FsbHNpdGUBMgABHtPr-ZKGO8_f96Xj0WUhTq8Lap2uAWoz9sIgF5Y3QVOuyswsO98OB-9zo6OM_aem_GjMeBvYxE3MTai8VDAgewA&brid=1E16dMBo0d8FySYJcSI5sQ) If possible, please RSVP on our **Facebook** or **Meetup** pages so we can let the restaurant know how many people to expect. We will have a few extra seats available for last-minute joiners, but we get a big crowd, so please let us know! We don't want to leave you sitting at the bar!

Can’t make it out in person? Join your **DTs friends** for our Weekly Virtual Happy Hour — a relaxed, welcoming space to unwind, chat, and connect from wherever you are. Whether you’re catching up with familiar faces or meeting new people for the first time, Virtual Happy Hour is all about easy conversation, shared laughs, and low-pressure connection. Bring your favorite drink, get comfortable, and drop in when you can. ✨ **No RSVP needed. Just click the link and join.** Come relax, connect, and **find your tribe** with DTs — from anywhere. 💙💻 Join in via Google Meet: [https://meet.google.com/jvc-ajhk-vci](https://meet.google.com/jvc-ajhk-vci)

Title: Foundations of Localized Symmetry Mathematics Date: April 18 2026 Noon - 14:00 EST Summary: The moment you use Euclid’s definitions of points and distances in any of your mathematical axioms, all that follows is assured to produce some level of nonsensical results when applied to the foundations of physics. The reason is not complicated: Euclid’s definitions are deeply mired in accepting as a “given” the very concepts that emerge only in well-defined inertial frames, which in turn are local instances of symmetries that are always finite and context dependent. In this talk, Terry will discuss how reframing mathematics in terms of symmetries that, as in the real world, are finite, composite, and dependent on self-observation (acceleration), results in a richer and far stranger set of mathematics in absolute conservation of quantum numbers generate local and global symmetries — the opposite of Noether’s theorem — that in turn create the emergent classical phenomenal such a particles, fields, space, and time. Speaker: Terry Bollinger is a computer scientist with BS, MS, and professional degrees from the Missouri University of Science and Technology.

***THIS WEEKEND!! APRIL 18, 2026*** **7:30-8:30** **pm Tango** Lesson by Michael Sims **8:30 -10:30** **pm** DJ Music by Michael Sims of [Lite on Your Feet Dance Studio](https://colvinrun.us7.list-manage.com/track/click?u=9abd22bfb1858c46263c2620b&id=918ea5a2ea&e=dc73d9bfad) $15 (cash or check) includes the lesson plus the dance, cold water and scrumptious snacks Dress is "ballroom casual." Please no cutoffs, T-shirts or jeans. Dress to Impress! No experience, reservations or partner needed. All Singles Welcome!! 1,850 sq. ft. beautiful oak dance floor. Plenty of free, safe parking Be part of the energy, spirit, and excitement which Michael brings to the dance floor! Michael's passion and enthusiasm is contagious! ***Be the first to sign up for a dance with Michael!*** ***Celebrating a birthday this month? Then we'd love to honor you with our delicious*** ## Questions? Find Colvin Run at [http://www.colvinrun.org](https://colvinrun.us7.list-manage.com/track/click?u=9abd22bfb1858c46263c2620b&id=4ff3df7365&e=dc73d9bfad) or visit http://www.meetup.com/colvinrun-org/ [Facebook](https://www.facebook.com/ColvinRunDanceHall/)

Come join your **DTs friends** for Thursday Night Happy Hour at **Breakers Sky Lounge**. Whether you’re reconnecting with familiar faces or coming solo and meeting new ones, this is an easy, welcoming way to unwind. We gather in the **spacious, open lounge near the entrance**, with plenty of seating and room to mingle. It’s relaxed, comfortable, and perfect for conversation. Breakers offers a **full bar with table service** and a **casual menu** of snacks and favorites. ✨ **No RSVP needed. Optional dinner afterward, as usual.** On occasion, Happy Hour plans may need to change. We’ll share updates as soon as we’re able. Come relax, connect, and **find your tribe** with DTs. 💙🍸