An exploration of basic number systems including the integers, rationals, reals, complex and beyond.

Prerequisites: Consent of instructor.

1 - 6

Units

Pass no pass

Grading

1, 2, 3

Passtime

None

Level Limit

Creative studies

College
These majors only matcs math
CASTEELS K L
Karel Casteels
4.3
46 reviews
Fall 2025 . Casteels K L
CRST 164B
M W F
11:00 AM - 11:50 AM
See All
MATH CS 120FN Casteels K L Fall 2025 Total: 12
MATH CS 120FN Casteels K L Fall 2024 Total: 13
See All
46
4.3
MATH3B . Casteels K L 7 Days Ago

I retook the course with this professor after getting a D+ in my first attempt of math3B with a different professor and I wish I had him for math3b the first time. exams were fair in terms of difficulty and the professor was great at explaining most concepts and would show us multiple examples which i found helpful.

0 helpful 0 unhelpful
MATHCS120 . Casteels K L 2 Months Ago

Amazing professor. I'm taking his Number System and Combinatorics this quarter. The workload is ~4 questions/week/course. One of the most memorable moments was when a HW problem in Combo was a trivial case of an open problem. I emailed him at midnight, said I proved a stronger result. He replied super fast with tons of books and related materials.

0 helpful 0 unhelpful
MATHCS120 . Casteels K L 4 Months Ago

Five points might be the upper limit of rate my professor, but definitely not the upper limit of Karel.

0 helpful 0 unhelpful
MATH132A . Casteels K L 11 Months Ago

he admits himself that he's not an expert on this class and isn't really good at explaining but makes up for it by giving out free homework scores. you only need a 60% on hw to get full credit, but can sometimes be a hassle. exams are pretty computation heavy. dont expect the exams to be a copy past of the practice, theyre not. anythings fair game

0 helpful 0 unhelpful
MATHCS120 . Casteels K L 1 Year, 6 Months Ago

This prof would constantly forget to post important things on canvas which can be really annoying when you're trying really hard to get a good grade in the class. Homework is really hard and it just doesn't seem like he gaf. Somewhat funny but makes everything more complicated than they need to be

0 helpful 0 unhelpful
MATH117 . Casteels K L 1 Year, 7 Months Ago

He's the one

0 helpful 0 unhelpful
See all 46 reviews
MATH 118A
70 / 70 Full
Real Analysis
Darren Long 3.5 Elie Abdo 4.9
T R
09:30 AM - 10:45 AM
MATH 118A
65 / 65 Full
Real Analysis
Ruimeng Hu 4.4
M W F
09:00 AM - 09:50 AM
MATH 118A
39 / 50 Enrolled
Real Analysis
Gustavo Ponce 2.5
T R
11:00 AM - 12:15 PM
MATH 119A
68 / 70 Enrolled
Ordinary Differential Equations
Hanming Zhou 3.5
T R
14:00 PM - 15:15 PM
MATH CS 120FC
9 / 25 Enrolled
Algebraic Combinatorics
Jon McCammond 4.5
T R
11:00 AM - 12:15 PM
MATH CS 121
23 / 25 Enrolled
Probability
Alexander Shkolnik 3.7
T R
13:00 PM - 14:15 PM