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1d
comment Book recommendation for ordinary differential equations
And here is one more example, which comes to mind: a book for famous Russian mathematician: Ordinary Differential Equations, which does not cover that much, but what is covered, is covered with absolute rigor and detail. Even better if you read Russian and can pick up a last edition.
1d
comment Book recommendation for ordinary differential equations
@primenumber57 I do not know a lot of book that would prove Osgood's theorem. One of them is Hartman, ODE which is basically a bible for researches in ODE, and covers pretty much what was known by 1960. But this is not a textbook, and it requires quite a good background to start reading.
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comment Book recommendation for ordinary differential equations
@Evgeny Yes, there is very big difference. Most important, the level of rigor was reduced to make it possible to use this book in undergraduate "Nonlinear dynamics and chaos" courses.
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answered Book recommendation for ordinary differential equations
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reviewed Approve suggested edit on Calculate 1D random walk with alternating step size expected iterations to return to origin
Nov
17
reviewed Approve suggested edit on What do polynomials look like in the complex plane?
Nov
17
reviewed Reject suggested edit on Is this claim true$(\xi \circ k)(s)=(k \circ \xi )(s)=0$ $\implies$ $k(s)=\zeta(s)=0 $ is true if and only if RH is false?
Nov
14
comment Fundamental Matrix
@dustin Matrix $A$ in the problem is not constant. You cannot (in general) use this approach. This is my last hint to you.
Nov
14
answered Fundamental Matrix
Nov
14
comment Fundamental Matrix
@dustin Instead of giving an absolutely irrelevant reference, you should either fix your answer, or delete it as completely wrong.
Nov
14
comment Fundamental Matrix
You seem to totally ignore my comments. Therefore, -1.
Nov
14
comment Fundamental Matrix
You should start with the second equation, and then solve the first one.
Nov
14
comment Fundamental Matrix
This is all simply wrong.
Nov
14
comment Fundamental Matrix
Done. Now your turn.
Nov
14
comment Suggested Reading for Combinatorics
Almost everything, if I recall correctly, is in Lurie's notes. They will require some work, but give a very solid background.
Nov
14
answered Solving a simple system of equations
Nov
13
reviewed Approve suggested edit on How to prove that $f(x)=\frac {\sin(1+x)}{1+x}\;(x \neq 1),\; 1 \;(x=1)$ is continuous?
Nov
13
reviewed Approve suggested edit on Bond worth given yield to maturity
Nov
12
reviewed Reject suggested edit on Permutations with forbidden values
Nov
12
reviewed Approve suggested edit on probability question with more than one factor