An interesting fact is that Tn (x) equals the determinant of the tridiagonal n by n

▯ Color Photography ▯ 1839: when photography was invented (Daguerreotype)  hand-colored because they didn’t know how to preserve color  rosy hue on cheeks: make them look more alive  Lended a bit of artistry to photography ▯ Photochromes  Starts with B+W photo and then paints in the color in the process of chromolithography: you add colors one by one to get a full color image  William Henry Jackson – brought lots of negatives and used this process, pictures of west  Individual photographers weren’t credited  Postcards made o African American cotton pickers in the south ▯ James Clerk Maxwell: three filters, red blue and green: you can get a color image