Loves his Yop©. Can't teach

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He doesn't know what's math

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useless

About 100 registered, 15 where actually coming to class, I and still wonder why...

mid term average for PDE 45%...he's unclear,makes alot of mistakes,horrible accent, if the material is difficult or the book not good don't take his class

I feel like my other profs are gods when compared to this guy....and he ain't hot...he went off in class in chinese for 5 minutes...he has a very very heavy accent and mumbles a lot, so there's no way ur gonna understand what he's saying...i just study on my own for this $%^& class.

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This guy totally sucks... He can't speak english.. it is as if he just got deported here. I do not know why he is teaching this class. Luckily the book is great and you can make it without him and his complicated notes. DO NOT GO SEE HIM FOR HELP.. He'll yell at you!! seriously

AVOID!!! Just absolutely horrendous. Take summer classes, just do anything to avoid this guy. Bad doesn't even begin to describe how awful he is. You can't understand him and he just reads his notes. Class is worthless. Buy a Schaum's guide to save yourself. It's the only way to do well.

I'm sure even Bozo the Clown can teach this course better than Xu. He uses SLIDES to teach maths, which is pretty much a good way to get lost in the lectures. He is unclear, and listening to him demands way too much effort. People that like this guy must be math nerds and bond with him or something.

He is SO BORING and unhelpful that i found this class difficult for just that reason. i'm glad some find his accent entertaining, but i couldn't understand a damn thing.

if you like to laugh at chinese accents, take him. but thats all ull get. hes terrible!!

cant understand a word he says!!! stay away from him!!! so unhelpful and not clear...

Just a bad prof. Cannot teach. Teaches MATH off of a PDF DOCUMENT. Gets lost on the board. The accent wouldnt have bothered me if he was a good prof, but it just makes it worse... AVOID IF POSSIBLE

Worst teacher ever. The fact that he provides you with the notes does not help. If you want to pass this class: PRINT out the assignments, bring them to class and try to work on them in class (it will keep you focused on the material instead of sleeping or skipping like the vast majority of my peers).

Entertaining and funny guy, but the good part stops here. Do not make the mistake of listening to him; it is a waste of time. Go to class, but do the stuff on your own. You will do well if you work a lot by yourself, and read the book. Oh, and when you ask him a question he will yell at you as if you just insulted him.

Is there an oral exam for professor to be teach ?

Horrible, horrible prof who

Worst Prof. I have ever had. It's better to teach yourself out of the textbook. I'm glad I never went to class and instead caught up on many many many hours of sleep!

Absolutely impossible to understand unless you're passive in Chinese. I had the assignment answers, whcih basically made me pass the course. I wish i could put him a NEGATIVE in: 'board-writing skills' and 'english-speaking skills' and 'overall teaching skills'. The book saved me. All in all, take him if you feel your GPA is too high/exagerrated

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One of the worst profs hands down. Does not seem to care about the student. Totally incomprehensible, arrogant and afraid to say not very bright. Very unclear about projects and never available during office hours. Has no TAs. Avoid at any cost. I still cant put together enough words to describe the extent to which he sucks at teaching.

I've been to McGill for 3 years now, and he is by far the worst teacher I had. Not only are his notes and accent pretty terrible, but he doesn't follow the book and worst of all, if you ask him a question, he will straight up question your intelligence instead of answering your question. Grading is not fair either. Seriously, avoid.

Worst math prof I've had and I'm in math! Had an interest in this course, completely turned off now. Messy notation, berates you for asking questions. Assigns homework without notification, sometimes rife with typos. Refuses to explain WHY when discussing theory (3 days discussing linear independence without relevance to DEs, then BAM! 5 examples)

WRONSKIAN!

Just plain terrible, and contrarily to a few not so good math teachers at McGill, this prof is not helpful at all outside of class. In fact he's more of the type to try to insult you rather than help you if you don't understand something. Oh and doesn't follow class book at all, has his own method for doing things.

WOW! really bad teacher, don't ask questions or he will get pissed off for not understanding! I am not one to dislike a teacher for his accent, but this one is absolutely incomprehensible. Use Paul's Math Notes and go to tutorials to actually learn what to do for ODEs, or else be prepared to be completely lost

This guy can not be understood, and he uses his own book, which sucks, it has unfinished examples everywhere and he skips large chunks of math and essential definitions. Also he made the final way too long, completely different from post finals, and full of questions that we had never done before. He does not post your marks from assignments either

Simply stated, he is the worst professor I have ever had. He will yell at you if you ask him questions, claiming that you would know the answer had you been in class, but he is completely incomprehensible to start with. He refused to help me on fair questions several weeks before the final only to give us an exam that almost nobody could pass.

Horrible teacher, horrible notes, horrible exam. He should refund all students that have paid to take his class because he is not willing to actually dedicate his own time or personal effort to helping you learn anything. It blows my mind that McGill is keeping him around.

Going to class is useless. Unfair grading style. Easy material.

The material itself isn't too hard, and the midterm was a piece of cake. But the final was completely ludicrous and unfair and had almost nothing to do with what we learned in the course. Think you can escape Xu by taking the class with another professor? Nope! Xu makes the final exam regardless so 90% of the class will fail it.

The professor is really bad concerning the explanation, better not to go to class!

I learned all the material by myself! You won't understand anything from what he says, and get depressed every time you go to class! Horrible teacher! He is not even a teacher!

JJ xu is another level of awful. he is incomprehensible and is five seconds away from speaking chinese in any given class. His T.A.'s dont respect him and they readily admit he is an awful prof. use MIT OCW its far more helpful.

Tips for this class: 1) Don't go to class. Learn everything using Pauls notes/knan academy/the textbook. 2)Study hard for the midterm, it's a lot easier than the final and doing well will take a lot of pressure off. 3) If Xu posts the student numbers of the TAs (he did for us), there is a way to get all your webwork answers.

??? that is what he sounded like in class and his writing on thhe board was even more unclear dont understand how this man is allowed to teach. only good part is that you can write anything and then put QED at the end of a proof and he will give you full marks. just dont go to class unless you want to pick up another language. ????????!

just dont. but if you have no choice, go to class from time to time to know what will be on the exam and expect to want to kill yourself.

Homework is difficult, not helpful at all.

Sometimes it almost seems like he doesnt want his students to do well.

He's the worst professor to ever live, full stop. He doesn't want his students to pass, let alone do well, and he is ridiculous to the n-th degree. He will make ODE be a horrible nightmare. Never, ever, ever attend his classes.

The material for this class is not difficult. However Xu made it as difficult as possible. So not helpful. I would not recommend taking this course with Xu.

The worst professor I have ever had. I have no idea why this man is still allowed to 'teach'. Gives 'trick' questions on the tests and exams where the tricks are providing wrong information. I think he derives pleasure from failing students..

I improved my Chinese quite a bit. Seems like he was creating his own words half of the time. You can write anything that looks mathish and he will give you your points since he doesn't care about whether or not you learn . Strongly recommend to avoid his class. The final was a mess, some people were crying at the end...

Talks to the board in some strange language that resembles Chinese but isn't while he scribbles nonsensical drivel in unknown abbreviations. Got a question? You'll be lucky if he hears you. If he understands you, I will find you and I will personally give you a medal. Textbook? His course notes. Verdict: you're on your own. PS exams are crazy.

If you go to lectures, you will become less knowledgeable from over-complication. Textbook is definitely a must for this course, along with an "English to Xu" dictionary. He is very theoretical. His exams are challenging, but not super hard. If you read the textbook and do and understand every single problem, you will do just fine...

He's so mean and won't clarify (which is not great, seeing as he's still struggling with his English language skills). Basically learned everything from Paul's notes and the text book.

Worst teacher I've ever had. Doesn't speak with any proper mathematical lingo, can't read his own notes, will stop in the middle of a derivation because he can't remember the rest of it. Answers all question with "Come to office hours." , if he hears them. He was incorrect about whether or not we were allowed calculators on the midterm HE WROTE.

Some of us failed the final, so we have to take the supplemental exam in a couple weeks. Xu said the supplemental would BE HARDER. Because WE FAILED IT THE FIRST TIME, we really need the supplemental to be HARDER. That's the kind of logic this man has. Avoid at all costs.

Avoid at all costs. If you couldnt already tell all the good responses are sarcastic af. Haven't taken this hard of a class every anywhere. His lectures are pointless. Never once turns his body towards the class, always looking at the board. Never stops writing to allow for questions. Wouldn't even be that bad, but his english is nonexistant.

Absolute worst teacher on the planet. He can't speak English(although what he does say is hilarious since it makes no sense), is a tough grader, has difficult exams and has horrendous notes. Unclear grading schemes. Worst. Don't do it. Just don't.

It's almost funny how bad of a teacher he is. Spends the class talking to the board. Attendance rate was about 12 students on a good day. His handwriting is borderline undecipherable, although his pdf notes are decent. Very very hard to understand his accent but midtermfinal very fair. You have to practice but don't bother with lectures.

Unfair midtermfinals, rediculous lectures, preach the textbook - iz your bible. I used to like math

Avoid or take his course just for fun! If you have to take a course with him, suck it up and don't ever defer your exam. I deferred mine and it was a big mistake. I read the whole textbook, understood it , did the regular exam,thought i was fine and I was wrong. The deferred exam is at least twice as hard as the regular one. lol

run forest run

JJ Xu as we call him is the worst math prof at McGill. No one can understand what the professor is saying. Midterm and written assignment due on eleciton day when administration emailed: "Professors and instructors are urged to avoid the scheduling of tests on October 19." Does he not think we have other classes?

They say if you haven't taken a class with Prof. Xu, you haven't done Engineering at McGill. Indeed, the infamous Lord JJ will push you to the utmost limits of sanity, as you frantically attempt to understand ANYTHING in lectures, sacrifice many hours to keep up with his blazing pace, then have everything you ever knew crushed by his ruthless exams

Really bad teacher, doesn't know how to explain anything. Smart guy, though grader. Avoid him if possible

Xu is the absolute worst. He is not clear in his explanations and of no help whatsoever if you ask him a question. Exams are tough. The questions were doable but all unnecessarily long.