Mathematics and mathematics education in the 21st century [pdf]

First paragraph intro is helpful for understanding if you want to bother opening the PDF:

What this paper is about and for whom it is written.

In this paper, we try to explain that mathematics as a scientific discipline enters the period of crisis. In plain words, research level mathematics is becoming too complex for human comprehension. This has serious implications for mathematics education, and our paper is written for everyone who cares about it.