How about this: An infinitely long sheet, but with small grey lines drawn between pages to show you where you're working. This would give users the benefit of an infinitely long sheet of paper without sacrificing export functionality. In a world where a problem can take as much as 3 pages to do, this would be a godsend and save a lot of flipping back and forth between pages to see where I was on the previous page.
How about this: An infinitely long sheet, but with small grey lines drawn between pages to show you where you're working. This would give users the benefit of an infinitely long sheet of paper without sacrificing export functionality. In a world where a problem can take as much as 3 pages to do, this would be a godsend and save a lot of flipping back and forth between pages to see where I was on the previous page.