lorem ipsum

Any lesson involving scissors and glue
I’ll gladly leave to others – adieu!
keywords: education, instruction, training, teaching, learning, study, curriculum, poem, poetry

OBSERVATION

As you proceed in mathematics, your success depends more and more on formatting and bookkeeping, just as it was discovered long ago that government consists mostly of record-keeping and cross-indexing.
keywords: progress, improvement, insight

lorem ipsum

Definition. A line in the coordinate plane is a subset L of the coordinate plate such that there exist real numbers a, b, and c such that a is not 0 or b is not 0 and
L = {(x, y) | ax + by + c = 0}.
Note: This differs slightly from the notion of ‘linear equation’ in the context of ‘a set of simultaneous linear equations’, in which the canonical form is ‘ax + by = c’ – the idea being that the constants on the right-hand side get pulled off into their own separate column matrix.
keywords: Mathematics, Analytic Geometry, Algebra