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theHigherGeometer

A whole trove of links to scans of *old* maths textbooks, going back to Robert Recorde in the 16th century

resourceaholic.com/p/digitised

The collator writes

"I have mainly listed algebra and arithmetic books (rather than geometry books) because that's my area of interest."

www.resourceaholic.comOnline Historical Maths TextbooksResourceaholic - free resources and ideas for teaching secondary school maths

That page linked to this one:

forgottenbooks.com/en/Mathemat

which has a whole bunch of even more interesting books! But it seems there's a kind of membership model, or else some kind of restrictions on unregistered page views.

www.forgottenbooks.comMathematics

@highergeometer @11011110 Here is the page of Recorde's book “The Whetstone of Witte” where he invented the modern equals sign = : archive.org/details/TheWhetsto

(I think the same book may also have introduced for the first time the + and - signs, but I am not sure.)

It is also noteworthy for the word “zenzizenzizenzike” which is the word from the OED that contains the most z's and which means the eighth of a number.

Internet ArchiveThe Whetstone of Witte : Robert Recorde : Free Download, Borrow, and Streaming : Internet ArchiveOne of the key texts in the history of mathematics. The Whetstone of Witte was published in 1557, and was the book that introduced the equals sign in its...

@mjd @highergeometer I think you're missing the word "power": zenzizenzizenzike means x8, not x8.

@11011110 @highergeometer I meant to write “eighth root”.