Note on today's and tomorrow's lecture posted

I have posted an updated note containing

• Recipe for the linear 2-dimensional system, extended from what was posted at 0915, and in a slightly different approach than in the lecture;
• The example with trigs - the error I made was only on the final line. Here it is done differently (a bit more work but maybe more foolproof).
• The eigenvalue-based solution with the example from the lecture
• Examples to be covered tomorrow!