Minus the matrix bits, that's basically how I slogged through DiffEq. Showing up to class was pointless because the prof would make up an equation to explorativ

Minus the matrix bits, that's basically how I slogged through DiffEq. Showing up to class was pointless because the prof would make up an equation to exploratively solve and inevitably it would be poorly behaved and the lecture would end with "... And and and for this kind of problem we have to use numerical methods".