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https://books.google.com/books?id=z2Jt6jUx4UMC&pg=PA12&dq=thomas edison mathematics&hl=en&sa=X&ved=0CCgQ6AEwAmoVChMI4LXZvtudyAIVgpANCh1cSQVg#v=onepage&q=thomas edison mathematics&f=false