Math
105 (Basic Number Theory)  Winter 2021
Professor: CRISTIAN
D.
POPESCU
 Lectures: TTh 8:009:20am, online.
Office Hours: TTh 11:0012:00, online.
Office: AP&M
6256;
Phone: 8585346297; Email: cpopescu@math.ucsd.edu
Teaching Assistants: WEI YIN 
Discussion
Sections: W 7:007:50pm online.
Office Hours: TBA.
Email: wey101@ucsd.edu
COURSE DESCRIPTION
WHAT IS MATH 105?
This is a course in number theory, focusing on the basic properties of
integers. We will cover most of the material in Chapters 1, 2, 3, 5, 6 of the
textbook.
TEXT Harold M. Stark An Introduction to Number Theory, MIT Press 1987
EXAMS
 Midterm 1  Thursday, February 4, 8:00am. Topics: up to (including) 2.3.
 Midterm 2  Thursday, March 4, 8:00am. Topics: TBA.
 Final Exam  Thursday, March 18, 811am. Topics: TBA.

No notes, textbooks, calculators
are allowed during exams. No makeup exams will be given and no late
homework will be accepted. Cheating on an exam results in 0 points for
that exam, as well as
further disciplinary action. Please
read very carefully the following ACADEMIC
INTEGRITY GUIDELINES.
GRADING POLICY
 Midterms: 20% each; Final Exam: 40%;
Homework: 20%. The grading will be done on a curve, the median
corresponding to a B/C+.
CLASSROOM CONDUCT EXPECTATIONS
 Lecture attendance is mandatory.
 Electronic
devices: The use of electronic devices (such as cell phones, laptops,
tablets, iPods) for nonclassrelated matters while in class/section is not allowed.
No visual or audio recording is allowed in class/section without prior
permission of the instructor (whether by camera, cell phone, or other
means).
 Conversations: Please avoid having private conversations with your classmates during lecture and office hours.
 Email
etiquette: I will not discuss mathematics (e.g. solutions or hints of
solutions to HW problems) via email. Office hours and lectures are the
best venue for that purpose. However, if you have any type of
administrative questions regarding this class, please do not hesitate
to send me short and to the point email messages.
GETTING HELP
Help with mathematical problems:
 Section: Ask
questions in section  this is one of the main reasons why sections
exist.
 Office Hours: You
are strongly advised to take full advantage of your professor's and
ta's office
hours.
 Classmates: Sometimes
a classmate can help. Sometimes you can learn by working out problems
together with your classmates.
Help with personal problems which
affect your class work:
 Talk to the professor or, if appropriate, your
college provost.