Email: kdatchev@purdue.edu

Section 124 Lectures: Monday, Wednesday and Friday 9:30 to 10:20 AM, in REC 317.

Section 111 Lectures: Monday, Wednesday and Friday 10:30 to 11:20 AM, in REC 317.

Office hours: Monday 2:00 PM to 3:00 PM, Tuesday 2:00 to 3:00 PM, and Wednesday 11:30 AM to 12:00 PM, in MATH 602, or by appointment.

Textbook: **Elementary Differential Equations and Boundary Value Problems (10th edition)**,
by W. Boyce and R. DiPrima. No WileyPlus access code is needed. An older edition will also work, if you take care that you are doing the right homework problems (most of them haven't changed much since 7th edition or before).

We will try to cover most of chapters 1 (Introduction), 2 (First Order Differential Equations), 3 (Second Order Linear Equations), 4 (Higher Order Linear Equations), 7 (Systems of First Order Linear Equations), and 9 (Nonlinear Differential Equations and Stability). See the table of contents for details.

Aug 26 | Nothing. |

Sep 2 | Sec 1.1: 6, 12, 14, 22; Sec 1.2: 7, 8, 10; Sec 1.3: 1, 2, 3, 4, 5, 6, 8, 9, 17, 19, 20. |

Sep 9 | Sec 2.1: 15, 17, 20, 30, 31, 32; Sec 2.2: 9ac, 10ac, 13ac, 22 (do not solve for y), 27a (also solve for y), 28a (also solve for y). |

Sep 16 | Sec 2.2: 32b; Sec 2.3: 1, 2, 7ac, 8, 16; Sec 2.4: 1, 2, 3, 4, 5, 6, 14, 15, 21. |

Sep 23 |
Sec 2.5: 4, 12, 14, 18; Sec 3.1: 4, 12, 22, 23, 24; Sec 3.3: 2, 5, 8, 12. |

Sep 30 | Nothing, but look at the midterm review problems. |

Oct 7 |
Sec 3.4: 18, 28; Sec 3.5: 17, 30; Sec 3.6: 7, 15. |

Oct 14 |
Sec 3.7: 1, 6, 7, 13, 15, 19; Sec 3.8: 7ac, 11. |

Oct 21 |
Sec 4.2: 16, 18, 20, 21, 22; Sec 4.3: 4, 7. |

Oct 30 |
Sec 7.1: 1, 4, 7ab, 22ab; Sec 7.5: 1, 3, 5, 6, 24ab, 25ab, 26ab, 27ab, 29, 31. Note the unusual due date! For Sec 7.5: 1, 3, 5, 6, you may draw a phase portrait rather than a direction field. |

Nov 4 |
Sec 7.5: 2, 4, 7, 8; Sec 7.6: 1, 3, 5, 13, 17, 28. Whenever a problem asks for a direction field, you may draw a phase portrait instead. |

Nov 11 | Nothing, but look at the midterm review problems. |

Nov 18 |
Sec 7.8: 1ac, 3ac, 4ac; Sec 7.9: 4, 5; Sec 9.1: 13, 14, 15, 16. Whenever a problem asks for a direction field, you may draw a phase portrait instead. |

Nov 25 | Nothing. |

Dec 2 |
Sec. 9.3: 1, 3, 4, 5abc, 7abc, 27, 28; For problems 1, 3, and 4 above, you do not have to show the system is locally linear. Also do the following additional problems. |

Dec 9 |
This homework is optional, but if you do it I will drop your lowest homework score. Sec. 9.5: 13; Sec. 9.6: 1, 4, 5. Whenever a problem asks for a direction field, you may draw a phase portrait instead. Also look at the final review problems. |