The notation of the derivative of a function f, as d(f(x)/dx or dy/dx where y=f(x) is known as the Leibnitz notation. Some books say that it is not the ratio of dy and dx, which is in fact, truly speaking, not true. The quantities dy and dx are known as the differential of y and differential of x, and their ratio in that order represents the derivative function wherever it exists. So, this notation is extremely flexible.
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Gottfried Leibniz
He did this to go against traditional form and to mimic musical notation.
As you have watched the famous movie national treasure, that movie is not non- fiction. So there fore it is not real. The Declaration of Independence clearly on the back says when it was signed which is July 4th 1776 and that date is stated on the back with Regarding the message on the back, according to the National Archives, "While no one knows for certain who wrote it, it is known that early in its life, the large parchment document was rolled up for storage. So, it is likely that the notation was added simply as a label." There are no hidden messages.
According to National Archives: "In case you were wondering, there is writing on the back of the original, signed Declaration of Independence. But it is invisible, does it include a map, as the recently released Disney feature film, National Treasure, suggests. The writing on the back reads: 'Original Declaration of Independence, dated 4th July 1776.'
BC + AD - 1 You have to subtract 1 after adding the year BC to the AD year. There is no year Zero, so the calendar is not a proper timeline. This is not a matter of interpretation (like the new millennium arguments). If you were born in 1 B.C., then you were one year old in A.D. 1. That's 1 + 1 - 1. If the start and end years are both BC, then it's a simple subtraction of the smaller number from the larger number, just as you would calculate your own age today. Note that "BC" is properly written after the year, but "AD" (Anno Domini) goes before the year. If you use the more inclusive "Common Era" notation, then both "CE" and "BCE" go after the year.