Norms

• one-norm: use an inner product

• Euclidian norm: you might be ablet o do closed form

• Infinity norm: this is a min-max

Hard constraints

• integer constraints: relax the constraint to make it easier

Block matrix tips / substitutions

Don’t be afraid to make substitutiosn, like let $X = A^T\lambda$, because it might help you see a simpler form. If you have similar linear operations on one set of variables, you might be able to express the set of expressions as a block matrix