Studying Looking for textbook/online resourse

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Recommendations for learning calculus emphasize the textbook by Keisler, which is praised for its comprehensive coverage, including multivariable calculus and differential equations. It is notable for its unconventional approach, focusing on the historical method of calculus using infinitesimals, which some consider superior for its applications in physics and mathematics. While it also addresses standard formalism, users should be prepared for a different perspective that may be confusing to those accustomed to traditional calculus texts. The book is available for free, making it an accessible resource for learners. Additionally, it adequately covers essential concepts like limits, ensuring a well-rounded understanding of calculus fundamentals.
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Homework Statement


Hello!

I would be grateful for recommendations on a truly brilliant, fully explanatory textbook or online resource to learn calculus (with problems sets, etc), including explanations and problems on derivatives, integrals, etc.

Thank you very much!

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In my opinion, the most brilliant textbook in calculus is Keisler: https://www.math.wisc.edu/~keisler/calc.html
First of all, it is completely free! It contains about everything one should know about calculus including multivariable calculus, vector calculus and a bit of differential equations.

But a word of warning. This book is truly nonconventional. It deals with calculus the historic way, that is the way that calculus was first done, namely with infinitesimals. In my opinion, this is a superior technique, and it is very useful in physics and math too. But it is not the way that most calculus books deal with things. Now Keisler does treat the standard formalism too, but just be aware that you will see things done quite differently than in other books. In my opinion, seeing things from multiple points of view is beneficial, but some might consider it to be confusing.
 
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micromass said:
In my opinion, the most brilliant textbook in calculus is Keisler: https://www.math.wisc.edu/~keisler/calc.html
First of all, it is completely free! It contains about everything one should know about calculus including multivariable calculus, vector calculus and a bit of differential equations.

But a word of warning. This book is truly nonconventional. It deals with calculus the historic way, that is the way that calculus was first done, namely with infinitesimals. In my opinion, this is a superior technique, and it is very useful in physics and math too. But it is not the way that most calculus books deal with things. Now Keisler does treat the standard formalism too, but just be aware that you will see things done quite differently than in other books. In my opinion, seeing things from multiple points of view is beneficial, but some might consider it to be confusing.
Thank you very much! I absolutely agree that seeing and learning different approaches is very helpful.
 
micromass said:
In my opinion, the most brilliant textbook in calculus is Keisler: https://www.math.wisc.edu/~keisler/calc.html
First of all, it is completely free! It contains about everything one should know about calculus including multivariable calculus, vector calculus and a bit of differential equations.

But a word of warning. This book is truly nonconventional. It deals with calculus the historic way, that is the way that calculus was first done, namely with infinitesimals. In my opinion, this is a superior technique, and it is very useful in physics and math too. But it is not the way that most calculus books deal with things. Now Keisler does treat the standard formalism too, but just be aware that you will see things done quite differently than in other books. In my opinion, seeing things from multiple points of view is beneficial, but some might consider it to be confusing.

Indeed, all books I have encountered previously (not yet helpful, although I have almost read through one of them, to no avail) use the notion of limit; same is used in statistics.
 
Limits are a very important concept. But Keisler certainly covers it and he covers the classical definition of a limit too. So you won't miss out!
 
Hey, I am Andreas from Germany. I am currently 35 years old and I want to relearn math and physics. This is not one of these regular questions when it comes to this matter. So... I am very realistic about it. I know that there are severe contraints when it comes to selfstudy compared to a regular school and/or university (structure, peers, teachers, learning groups, tests, access to papers and so on) . I will never get a job in this field and I will never be taken serious by "real"...
Yesterday, 9/5/2025, when I was surfing, I found an article The Schwarzschild solution contains three problems, which can be easily solved - Journal of King Saud University - Science ABUNDANCE ESTIMATION IN AN ARID ENVIRONMENT https://jksus.org/the-schwarzschild-solution-contains-three-problems-which-can-be-easily-solved/ that has the derivation of a line element as a corrected version of the Schwarzschild solution to Einstein’s field equation. This article's date received is 2022-11-15...

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