[Karliner]

>p>I was telling my wife that these formulas in Calculus are the same yesterday, today and tomorrow.

Yep first time I went through math I was using supplemental books from my grandpa in the 1920's and my dad in the 1950's...same formulas, only back then there were few analogies, you either learned or burned.

[Reily]

I love those old science & engineering textbooks!
So much better written then those today!

[TheConservativeTejano]

Partner, like someone told me a long time ago that once a formula has been proven mathematically to be true then you can take it to bank or you can it as Gospel Truth.

A lot of these formulas in mathematics have all been proven to be correct.