While we're figuring out how to get king sized pdfs into the iPad internal drive, I started emailing pdfs to myself on the ipad. You can get a test document at
http://www.higgs-boson.org/files/mass.pdf
In section 1.6, Einstein Field Equations, there is a sentence:
"Hiding the cosmological constant Λ, ..."
The greek letter lambda (Λ) does not appear when viewing the file from either Safari or the built-in app that reads pdf attachments in email. Shame, shame Apple. You really did HIDE the cosmological constant, didn't you? There are other missing math symbols, which you physicists will note. How am I supposed to turn my child into an Einstein, if the Apple so-called "Einsteins" can't even render Greek letters properly?