Where Can I Find an Accessible Introduction to Hyperfunctions?

[Coelum]

Dear all,
I read about hyperfunctions in Penrose's masterpiece "Road to Reality" and I just met them again (in disguise) in a set of notes on "tricks on computing definite real integrals". Being an engineer with a curiosity for math, I would like to understand a bit more, so I am looking for a tutorial or an introduction to hyperfunctions, possibly with exercises. So far I found only costly or out-of-stock textbooks (like Kaneko's "Introduction to the Theory of Hyperfunctions" - 175$ ! - or Imai's "Applied Hyperfunction Theory" - out of stocks). I also found the original Sato's articles (from Wikipedia), but they are too technical and dry for my background. Any hint?
Thanks,

Francesco

 

[Gib Z]

Unfortunately, seeing as most of the theory has only been developed in the last 50 years, you can bet that most treatments of the topic will have about that (high) level of technicality. Imai's book would be the least technical and is designed for physicists/engineers, but is quite hard to find. You might just have to find another mathematical curiosity to pursue.