In lab 2 we consider the van der Pol equation, x 00 + µ(x 2 − 1)x 0 + x = 0. (a) Show that at the critical point x = 0, the linearized system is that given in the lab, x 0 = y, y 0 = −x + µy. (b) Solve the system for µ = 0, µ = 0.1, and µ = 3. (c) For each of these, sketch, by hand, the phase portraits for the system. Be careful to note how they differ.

Negative 5 1/12 + negative 4 1/4 + 6 3/4

Design an er diagram for keeping track of information about votes taken in the u.s. house of representatives during the current two-year congressional session. the database needs to keep track of each u.s. state's name (e.g., texas', new york', california') and include the region of the state (whose domain is {northeast', midwest', southeast', southwest', west'}). each congress person in the house of representatives is described by his or her name, plus the district represented, the start date when the congressperson was first elected, and the political party to which he or she belongs (whose domain is {republican', democrat', 'independent', other'}). the database keeps track of each bill (i.e., proposed law), including the bill name, the date of vote on the bill, whether the bill passed or failed (whose domain is {yes', no'}), and the sponsor (the congressperson(s) who sponsored - that is, proposed - the bill). the database also keeps track of how each congressperson voted on each bill (domain of vote attribute is {yes', no', abstain', absent'}). additional information:

Perry observes the opposite parallel walls of a room in how many lines do the plains containing the walls intersect