Basic information
Welcome to Topology I!
This course is the first half of a year long introduction to topology. In this first half of the course, we will primarily discuss point set topology. The main part of the course will cover most of chapters 2-4 and chapter 9 of Munkres' textbook and parts of chapters 0-1 of Hatcher's book, including: basic definitions and examples of topological spaces and continuous functions, properties of topological spaces used to distinguish between shapes (such as connectedness, compactness, separability), deforming one space into another ("homotopy"), the fundamental group, and applications. The central learning objective of the course is to develop skills in logical reasoning and reading and writing proofs.
Course expectations: Attendance is expected, as much as possible, but please do not attend class if you are feeling ill. By enrolling in this class, you are agreeing to be an engaged student, to come to class with a learner's attitude, and to encourage your fellow students to do the same. Regular class attendance and participation, and working through the homework, are your best methods for insuring that you will keep up with the material, and to make sure that you understand all of the concepts.
You are encouraged to work on the problem sets together in groups, or discuss them with me; you should however write up your own solutions. You are also encouraged to use our course materials while working on the problem sets, especially our class notes. See our course syllabus for the AI policy for this class.
Office Hours: Mondays 5 – 6 pm and Fridays 10:30 – 11:30 am.
Apart from these notes, the primary textbooks for the class are
Munkres' Topology, Second Edition
Hatcher's Algebraic Topology, available electronically on the author's website
Final Problem Set 1: due Tuesday, September 1 (tex) Solutions
Final Problem Set 2: due Tuesday, September 8 (tex) Solutions
Final Problem Set 3: due Tuesday, September 15 (tex)
Solutions
Final Problem Set 4: due Wednesday, September 23 (tex)
Solutions
Final Problem Set 5: due Tuesday, September 29 (tex)
Solutions
Final Problem Set 6: due Tuesday, October 6 (tex)
Solutions
Final Problem Set 7: due Wednesday, October 14 (tex)
Solutions
Final Problem Set 8: due Wednesday, October 21 (tex)
Solutions
Incomplete Problem Set 9: due Tuesday, November 3 (tex)
Lecture 1 (Monday, August 24): What is a topology?
Lecture 2 (Wednesday, August 26): Worksheet 1: Topologies
Lecture 3 (Friday, August 28): Bases for a topology
Lecture 4 (Monday, August 31): Examples of bases.
Lecture 5 (Wednesday, September 2): More about bases. The product topology.
Lecture 6 (Friday, September 4): Topologies on the cartesian product. Closed sets.
Lecture 7 (Wednesday, September 9): More about closed sets. The subspace topology.
Lecture 8 (Friday, September 11): Worksheet 2: The subspace topology
Lecture 9 (Monday, September 14): Takeaways from Worksheet 2. Closure and interior.
Lecture 10 (Wednesday, September 16): Closure and interior.
Lecture 11 (Friday, September 18): Hausdorff spaces.
Lecture 12 (Monday, September 21): Worksheet 3: closures, limits, and Hausdorff spaces.
Lecture 13 (Wednesday, September 23): Continuous functions.
Lecture 14 (Friday, September 25): More on continuous functions.
Lecture 15 (Monday, September 28): Worksheet 4: Review for Midterm 1.
Midterm 1: Monday, September 28, 5:30 pm, in Avery 351 (solutions)
Lecture 16 (Wednesday, September 30): Properties of continuous functions.
Lecture 17 (Friday, October 2): Comments on Midterm 1. Homeomorphisms.
Lecture 18 (Monday, October 5): Homeomorphisms and topological invariants.
Lecture 19 (Wednesday, October 7): The product topology in general.
Lecture 20 (Friday, October 9): Worksheet 5: The product topology and continuous functions.
Lecture 21 (Monday, October 12): The product topology: more examples.
Lecture 22 (Wednesday, October 14): Metric spaces.
Lecture 23 (Wednesday, October 21): Wrapping up metric spaces.
Lecture 24 (Friday, October 23): Quotients.
Lecture 25 (Monday, October 26): Worksheet 6: Review for Midterm 2.
Midterm 2: Monday, October 26, 5:30 pm, in Avery 351
Worksheet 1: Topologies (Solutions)
Worksheet 2: The subspace topology (Solutions)
Worksheet 3: Closures, limits, and Hausdorff spaces (Solutions)
Worksheet 4: More review problems for Midterm 1 (Solutions)
Worksheet 5: The product topology and continuous functions (Solutions)
Worksheet 6: More review problems for Midterm 2 (Solutions)
University of Nebraska-Lincoln
This course is the first half of a year long introduction to topology. In this first half of the course, we will primarily discuss point set topology. The main part of the course will cover most of chapters 2-4 and chapter 9 of Munkres' textbook and parts of chapters 0-1 of Hatcher's book, including: basic definitions and examples of topological spaces and continuous functions, properties of topological spaces used to distinguish between shapes (such as connectedness, compactness, separability), deforming one space into another ("homotopy"), the fundamental group, and applications. The central learning objective of the course is to develop skills in logical reasoning and reading and writing proofs.
Course expectations: Attendance is expected, as much as possible, but please do not attend class if you are feeling ill. By enrolling in this class, you are agreeing to be an engaged student, to come to class with a learner's attitude, and to encourage your fellow students to do the same. Regular class attendance and participation, and working through the homework, are your best methods for insuring that you will keep up with the material, and to make sure that you understand all of the concepts.
You are encouraged to work on the problem sets together in groups, or discuss them with me; you should however write up your own solutions. You are also encouraged to use our course materials while working on the problem sets, especially our class notes. See our course syllabus for the AI policy for this class.
Office Hours: Mondays 5 – 6 pm and Fridays 10:30 – 11:30 am.
Course notes
Here are the Course notes. I will be updating these throughout the semester. If you find any typos at all, however small, please let me know.Apart from these notes, the primary textbooks for the class are
Problem Sets
Instructions: You are welcome to work together with your classmates on the problems, and I will be happy to give you hints or discuss the problems with you, but you should write up your solutions by yourself. You will submit your work on gradescope; your submission should be a pdf file, but you are not required to type your solutions. If you prefer to handwrite your work on paper, there are apps like Scannable or Genius Scan that can scan your work into one pdf. See our course syllabus for the AI policy for this class.Schedule
Worksheets
Exams
We will have three midterms and a final, on- Monday, September 28, 5:30–7:30 pm
- Monday, October 26, 5:30–7:30 pm
- Monday, November 23, 5:30–7:30 pm
- Wednesday, December 16, 1–3 pm