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Activity 2.3.5
https://library.tbil.org/2024/linear-algebra/instructor/EV3.html#EV3-4-5 was a dud. I don't know if it's because we moved it back from EV7 where it used to live or what, but I do I like using homogeneous systems to give added motivation for defining a subspace, so I'm working on a proposal here to address the issue that my students simply did not know how to begin engaging with that activity.