Date: 21/02/2026
What subject(s) I've studied: Geometry I, Analysis I
Favourite fact I've learned: Matrices have multiple row echelon forms, but only one reduced row echelon form.
Favourite equation: $ Ax=b$ (Matrix equation of linear systems)
Something I need to revise: Integral functions
Something I've not understood: How to find the right counterexample in proofs
A mistake to avoid making: Isolating the wrong variable while solving linear systems (you have to write everything else in terms of the free variables!)
Favourite piece of media: Katherine Johnson's memoir (Italian translation)
Note to self: Rest must be deserved either from labour or illness, otherwise you will just get used to it and become lazy.