Good Books on Non-Standard Analysis?

[Q-1]

Hello,

I am looking for for some good books on non-standard analysis. Hoping for something simple and not too complex.

Any tips on good books appreciated.

 

[George Jones]

I am looking for for some good books on non-standard analysis. Hoping for something simple and not too complex.

You might like to look at Keisler's book on first-year calculus from the point of view of non-standard analysis, and Keisler's background book "Foundations of Infinitesimal Calculus". These are freely available from the links at

https://www.math.wisc.edu/~keisler/

 

[Q-1]

You might like to look at Keisler's book on first-year calculus from the point of view of non-standard analysis, and Keisler's background book "Foundations of Infinitesimal Calculus". These are freely available from the links at

https://www.math.wisc.edu/~keisler/

Thank you. That helps a lot.

 

[Demystifier]

Other books at a similar level are
https://www.amazon.com/dp/0521887186/?tag=pfamazon01-20
https://www.amazon.com/dp/0486428869/?tag=pfamazon01-20
https://www.amazon.com/dp/0486484521/?tag=pfamazon01-20