Introduction to Philosophy
https://gyazo.com/9426cf00a70cb46bd5ebe71352d92dec
The most "easy-to-understand" philosophy textbook I've read.
I guess "easy to understand" is different for everyone. I don't have a problem with the old font.
The PDF above is not the one I read, but the old kana usage has been changed to the new one.
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This page is auto-translated from /nishio/哲学概論. If you looks something interesting but the auto-translated English is not good enough to understand it, feel free to let me know at @nishio_en. I'm very happy to spread my thought to non-Japanese readers.