RIP for an unsung hero of an important subject.
I used his book at Ohio State during the late 70s for Math 151, 152 and 153. It had a red cover with a yellow lamp on the front. Propably only one of two textbooks where I remember the author's name. The other being "French" who was the author of my Engineering Graphics text and as I found out later, one of the designers of Ohio Stadium.
textbooks --> scam
1968? Just DAMN! Too late, again; if I'd had his book, maybe I would have passed the stinking course.
Even my gall bladder missed laser surgery by less than 6 months, so instead I have a scar that any VC would have been proud to inflict on a GI.
Story of my life; story of my life: day late, dollar short, and NO RESPECT!
I used his excellent book, which was an inspiration for one of my own.
RIP, Louis.