remove Library/Diagonalize.thy, because Library/Nat_Bijection.thy includes all the same functionality
## targets
default: dvi
## dependencies
dvi:
cd Isar/document; make dvi
pdf:
cd Isar/document; make pdf
clean:
cd Isar/document; make clean
mrproper:
rm -f *.pdf *.dvi
cd Isar/document; make mrproper