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Spencer Bagley

@sbagley.bsky.social

Math professor, inveterate shitposter, pride is all year round β€οΈπŸ§‘πŸ’›πŸ’šπŸ’™πŸ’œ

1,568 Followers  |  218 Following  |  5,455 Posts  |  Joined: 28.06.2023
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Posts by Spencer Bagley (@sbagley.bsky.social)

Ok good point! I was trying to think about function transformations more broadly as other examples but couldn't convince myself that students see them as operations on functions. Composition is a good shout though!

08.03.2026 04:48 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

This pulls together so many threads that I have been thinking about around teaching for so many years. In particular it completely explains my whole shit about the difference between grading and assessment.

08.03.2026 04:47 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

(It is, of course, also everyone's first operator on functions)

08.03.2026 04:42 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

I just had this thought and I want to write it down so I can think about it more later:
I think one reason why people learning calculus abuse derivative notation so much is that most familiar operations (on numbers) are binary but the derivative operator is unary.

08.03.2026 04:42 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

You ever start reading a book and just immediately go "well this is going to change the way I think about things forever"? Well anyway I just started C. Thi Nguyen's book The Score @add-hawk.bsky.social

08.03.2026 03:53 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

I was literally just thinking this, lol.

08.03.2026 00:30 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

In your defense that is still a pretty good bit

07.03.2026 23:02 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

I had to throw my hands up and walk away and be like "I gotta go," and she's calling after me like "he didn't get hurt!" Motherfucker, I gotta *go*, or I will be saying things that we'll both regret

07.03.2026 20:02 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Mind you that this is *after* she was complaining about the traffic calming devices the mayor has been installing and I told her how much safer they make my daily bike-to-work commute. Wild things to be saying to your neighbor who just told you he is a bicyclist!!!!

07.03.2026 19:56 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Neighbor lady complaining to me about how a bicyclist ran into her car. "They need to learn to watch where they're going." The only way I can figure out that it could have happened is that she overtook him and then turned in front of him. "He was going really fast!" Bitch how fast were *you* going?

07.03.2026 19:54 β€” πŸ‘ 4    πŸ” 1    πŸ’¬ 1    πŸ“Œ 0

*deep sigh* I know I am going to regret asking when in three weeks I am deeply absorbed by this game, but: What actually is Slay the Spire

07.03.2026 08:08 β€” πŸ‘ 5    πŸ” 0    πŸ’¬ 2    πŸ“Œ 0

Man we're to the reunion now and get this fucking guy off my television

07.03.2026 07:32 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Obviously the broader culture is not in a good place but it's heartening that television keeps returning to one of the eternal storytelling themes: Padma Lakshmi imperiously striding into the room and demanding that you make her a delicious treat.

07.03.2026 05:30 β€” πŸ‘ 1349    πŸ” 77    πŸ’¬ 24    πŸ“Œ 6

HAHA GIRL BYE

07.03.2026 06:08 β€” πŸ‘ 4    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

i'm taking a brave stance that may get me canceled: there is no reason for the pervert glasses to exist

04.03.2026 13:28 β€” πŸ‘ 6005    πŸ” 1503    πŸ’¬ 101    πŸ“Œ 47

Girl, why is Natalie Traitors always wearing a leather dress that looks like she made it herself while she was on Survivor

07.03.2026 04:14 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

brb getting an eyebrow pencil

07.03.2026 02:59 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Bribing myself with marshmallows to finish this FUCKING grading that has been on my plate for WEEKS

07.03.2026 02:24 β€” πŸ‘ 20    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

You are welcome to communicate your concerns about this to the Vice President of Student Affairs; if I were you I'd skip the Dean of Students, who I am pretty sure fought tooth and nail to avoid this

07.03.2026 01:58 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
06.03.2026 22:17 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

"But if these people mean you harm, then a student organization doesn't matter, they would do it anyway." Great so should we make it *easier* for them? Should we give them official permission and a budget? Should we throw them a parade

06.03.2026 21:08 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

"Well these students don't seem to me like they intend anybody harm" You credulous white asshole, of course they wouldn't seem like that to YOU. Do you know who they *do* seem like that to? All your minoritized colleagues, including me. So thanks for that!

06.03.2026 21:08 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

"Oh I knew [Nuyorican woman colleague] was in the national media but I didn't know she got death threats" my guy why are you acting brand new; what in the fuck did you think would happen after she made the national media

06.03.2026 21:08 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

"ooh I didn't know what Turning Point was, what's Professor Watchlist, I've never heard of that" Motherfucker, maybe those were questions you should have asked *before* signing on the dotted line

06.03.2026 21:08 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

www.youtube.com/watch?v=36pJ...

06.03.2026 21:06 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

HELL YEAH

06.03.2026 21:04 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

(Ok but may I suggest the intake fans bc the usb-c port is just not designed for efficient fluid transfer)

06.03.2026 17:49 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Unfortunately, β€œYo brother, legal team confirmed we can’t work with minors rn” is an instant classic

06.03.2026 13:38 β€” πŸ‘ 9519    πŸ” 2159    πŸ’¬ 88    πŸ“Œ 34

(The drunk driving one is actually a really good parallel for the stupid reasons this shit got approved, thank you for this example which I am putting in my pocket for when I meet with our VPSA who ultimately made the call)

06.03.2026 07:41 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Meeting tomorrow with the Benedict Arnold ass who agreed to be their faculty advisor. Genuinely not sure what I'm going to say.

06.03.2026 07:05 β€” πŸ‘ 7    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0