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CS109: Probability for Computer Scientists

Spring 2026

Monday, Wednesday, Friday 1:30pm - 2:50pm in-person in NVIDIA Auditorium

Week 1 TODO

Enjoy First lecture
Start PSet1 🌱
Sign up for a section!

Teaching Team

Instructor:
Chris Gregg

OH: Fri 9-11am
CoDa E128

Awesome TAs:

cs109 @ cs.stanford.edu

This Week in CS109

Date	Lecture	Outside Class
Mon, March 30th	Welcome, Probability Axioms	Read Syllabus
Wed, April 1st	Conditional Probability
Fri, April 3rd	Bayes Theorem

Welcome

Welcome to CS109! We are looking forward to an uplifting and exciting quarter. Class starts Monday, March 30th at 1:30pm PT in NVIDIA Auditorium. See you there 🌱.

Getting Started in CS109

The Syllabus page has details on course logistics.
The Honor Code handout describes how the Honor Code applies in the context of the work you will do in CS109.
The Schedule page has a list of all topics that we will cover in CS109, the lecture schedule, and the problem set dates and deadlines.
The Office Hours page has contact information for the teaching team. Office Hours will be listed on this calendar and start on Wednesday, April 1st.
Section enrollment details will be released on the first day of class; you do not enroll in section via Axess.

RESOURCES

Discussion
Course Reader
Syllabus
Schedule
Office Hours

Key Dates

Midterm: May 6th, 7:00pm
Final: Jun 8th, 3:30pm
Last lecture: Jun 3rd

Course Values

Everyone is welcome. Intellectual joy. Be kind. Be humane. Social connection. Learn by doing. Thrill of building. Adapt to new contexts.

CS109: Probability for Comp. Science

Spring 2026, MWF 1:30pm - 2:50pm, NVIDIA Auditorium