I like to read course material on Kindle. I merge all lecture slides with Automator and then send them to my Kindle email. Earlier, I have used Readle's Documents app (a spinoff of PDF Expert) where I had a search. If no OCR, then DjVU Reader in OS X to PDF and then ABBYY's FineReader Express to add OCR. Kindle has one failure with this: it cannot search despite the OCR of the PDF. It needs to be in a correct format: PDF is not a correct format but some Kindle's own format.
So does there exist any app in OS X to make material such as lecture slides suitable for reading in Kindle? Lecture slides are technical containing mathematical formulae.
It requires many steps already over OS X with Automator, DjVU Reader, ABBYY -- to make searchable in one way. I am trying to find an easy way with Kindle and Apple OS X.