# #8137

135141

May 1, 2019, 2:28 a.m.

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//Advanced Geometry Rose: I used to teach at this school with average kids. They weren't as intelligent as you guys, but if I taught stuff correctly they would understand. I will never forget this girl who often came to math help-- sometimes she'd be alone with us 2 math teachers and say, "I'm intimidated by you two!" Anyway, one day during math help I was demo-ing this classic proof that these triangles are similar, so that I could practice for next class when we actually did it. After I finished she just looked at me and said in the most confused voice, "...wolf pack?" And I was just looking at her like "What?" It turns out that she had never seen the Greek letter alpha besides stuff from biology like "alpha male", so when I used it as an angle, it didn't make any sense to her. //later, Daniel presents an important lemma that Rose had already forgotten from last class Reynald: Mr. Rose, you know that "wolf pack" girl? That's how Daniel views you.

# #8083

6464

April 4, 2019, 11:18 p.m.

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//Advanced Geometry //Dzhu helping Reynald with geogebra Rose: Oh no... when Daniel Zhu is at the computer, weird things start to happen. //later Rose: Okay, Daniel Zhu, explain Pascal's theorem in an intuitive way to me. Daniel: So... Rose: NO COMPLEX NUMBERS! Daniel: Consider the equation for a hyperbola in complex form.

# #7998

3537

March 11, 2019, 12:20 p.m.

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//Advanced Geometry, Steven and Laura missed last class //Daniel teaches Steven topic that took 45 minutes to teach last class Rose: This is kind of hilarious. Daniel teaches it to Steven in 3 minutes. Then, Steven teaches it to Laura in 7 minutes.

# #7970

138144

Feb. 27, 2019, 9:08 p.m.

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//Advanced Geometry //Dzhu is at the computer, drawing a diagram with Geogebra. Reynald stands watching Rose: Can we just have Reynald? He's easier to control. //later, as Reynald draws and the class explains the proof to Rose Rose: This is great, my responsibilities are shrinking, one by one, until I don't need to do anything.

# #7430

1212

April 19, 2018, 9:59 p.m.

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//9th period discrete. (Daniel Zhu is in 5th period discrete.) //Proving TFAE for finite projective planes Rose: We have 1 implies 3. So, we also get 2 implies 4 for free by duality. Jonah: But- Rose: Also Daniel Zhu said it.

# #7224

2020

Feb. 13, 2018, 8:44 a.m.

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//Practicing interviews Stav: How many letter a’s are on our website? *steeples fingers* Naveen: Well, uh… the most common vowel is e, so.. if we assume that your website has 2000 characters, then… Bosse: (Starts clapping) Thank you two for the interview! //Another interview Daniel: A permutation of n elements is chosen uniformly at random. A partition of the permutation into contiguous blocks is correct if, when each block is sorted independently, the entire permutation becomes sorted. Find the expected value of the maximum number of blocks into which the permutation can be partitioned correctly. Kevin Qian: Nice job stealing a question from a math competition. Have you even solved this? Daniel: To be honest, Bosse: (Starts clapping) Thank you two for the interview!

# #6473

99

May 24, 2017, 10:42 a.m.

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Daniel: And you multiply them all together and shake vigorously and then you get the tensor product