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  2. Function of a real variable - Wikipedia

    en.wikipedia.org/wiki/Function_of_a_real_variable

    The logarithm function is defined only for positive values of the variable. Some functions are continuous in their whole domain, and not differentiable at some points. This is the case of: The square root is defined only for nonnegative values of the variable, and not differentiable at 0 (it is differentiable for all positive values of the ...

  3. Real-valued function - Wikipedia

    en.wikipedia.org/wiki/Real-valued_function

    In mathematics, a real-valued function is a function whose values are real numbers. In other words, it is a function that assigns a real number to each member of its domain . Real-valued functions of a real variable (commonly called real functions ) and real-valued functions of several real variables are the main object of study of calculus and ...

  4. Function of several real variables - Wikipedia

    en.wikipedia.org/wiki/Function_of_several_real...

    The image of a function f(x 1, x 2, …, x n) is the set of all values of f when the n-tuple (x 1, x 2, …, x n) runs in the whole domain of f.For a continuous (see below for a definition) real-valued function which has a connected domain, the image is either an interval or a single value.

  5. Millennium Prize Problems - Wikipedia

    en.wikipedia.org/wiki/Millennium_Prize_Problems

    The real part of every nontrivial zero of the Riemann zeta function is 1/2. The Riemann hypothesis is that all nontrivial zeros of the analytical continuation of the Riemann zeta function have a real part of ⁠ 1 / 2 ⁠. A proof or disproof of this would have far-reaching implications in number theory, especially for the distribution of prime ...

  6. Banknotes of the Swiss franc - Wikipedia

    en.wikipedia.org/wiki/Banknotes_of_the_Swiss_franc

    The ninth series of the Swiss franc, currently in circulation. As of 2022, the Swiss 1000-franc banknote is the world's 2nd highest value currently-issued banknote, after the Brunei $10,000 bill (worth around 6,900 Swiss francs in 2022), followed by the Singapore $1,000 note (worth around 678 CHF) and the 500 euro note (worth around 490 CHF), was demonetised.

  7. Nvidia overtakes Apple as world's most valuable company

    www.aol.com/news/nvidia-overtakes-apple-worlds...

    Nvidia's stock market value briefly touched $3.53 trillion, slightly above Apple's $3.52 trillion, LSEG data showed. ... -Nvidia dethroned Apple as the world's most valuable company on Friday ...

  8. 10 Most Expensive Collectibles Ever Sold

    www.aol.com/7-most-expensive-collectibles-ever...

    An example graded Mint State 65 became the country’s most expensive gold coin and the second most expensive coin of any composition when it sold for $9.36 million in 2021.

  9. 9 of the world’s most valuable coins - AOL

    www.aol.com/finance/9-world-most-valuable-coins...

    In October 2007, the Guinness Book of World Records certified the coin as the world’s largest gold coin. The coin’s front shows Queen Elizabeth II, while the reverse shows a Canadian maple leaf.