The problem is that, in Math papers in journals, there's charges based on the number of pages used. You really would need an electronic format, and a wiki-styl

The problem is that, in Math papers in journals, there's charges based on the number of pages used. You really would need an electronic format, and a wiki-style format that graduate students can use, to fill in the details of all the proofs. When I was a grad student reading papers, it would sometimes take me a day or two to read a sentence, filling in all the details. I felt bad that there was no way for me to share my progress with others. Someone else reading the same paper (other than the author or a couple of other experts) would have to do the same thing as I did. I thought it would be a neat project, but my advisor said it would be bad for my career if I spent time on it, so didn't pursue it. To find a job, it would be based on the papers I published, and not based on making other people's research easier to read.