I would be interested in recommendations for easily accessible/somehow simply readable texts to Cochran-Orr-Teichner's filtrations on knot concordance:



> 
> Tim D. Cochran, Kent E. Orr, and Peter Teichner. "Knot concordance, Whitney towers and L2-signatures." Annals of Mathematics (2003): 433-519.
> 
> 
> 


Any suggestions will be appreciated.



Reference for Cochran-Orr-Teichner's filtrations on knot concordance
There are summarys of parts of Cochran, Teichner and Orr's paper in:


* [These lecture notes](https://www.maths.ed.ac.uk/%7Ev1ranick/surgery/sliceknots2.pdf) of Peter Teichner, typed up by Julia Collins and Mark Powell;
* [Mark Powell's 2011 Edinburgh PhD thesis;](https://www.maths.ed.ac.uk/%7Ev1ranick/papers/powellthesis.pdf)
* [Julia Collins' 2012 Edinburgh PhD thesis.](https://arxiv.org/abs/1206.0669)


You'll find all of these references (and I'm sure more besides) at [Andrew Ranicki's webpage.](https://www.maths.ed.ac.uk/%7Ev1ranick/surgery/notes.htm)


**Disclaimer:** I'm not a geometric topologist, but as I was in Edinburgh around the time I ended up as one of the examiners of Julia Collins' thesis.


