In latex documentation, I found this:
Then I searched that what does bk mean, and I found this:
After seeing this I thought that bk means book. And textwidth equals to 4.5in in book
class (font size 10pt). Then I compiled a pdf with papeeria:
And this equals to 345pt, but the docs said it would be 345 if it is not book
class. But it is still 345pt. Then I thought it might be possible that 4.5in equals to 345pt. But I found this:
Can someone tell me what I am understanding wrong?
Best Answer
bk
is adoctsrip
guard. If you look at the fileclasses.ins
in the latex base distribution then you will seeshowing that the book 10pt option file
bk10.clo
is generated using thebk
guard.The code you show is not for documents starting
\documentclass{book}
but for documents starting\documentstyle{book}
which triggers compatibility mode for documents written for LaTeX 2.09 and so ensures exactly the same sizes as you would have got using LaTeX 2.09 in 1992 before LaTeX2e was released.