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  2. Absolute value - Wikipedia

    en.wikipedia.org/wiki/Absolute_value

    The graph of the absolute value function for real numbers Composition of absolute value with a cubic function in different orders. The real absolute value function is continuous everywhere. It is differentiable everywhere except for x = 0. It is monotonically decreasing on the interval (−∞, 0] and monotonically increasing on the interval [0 ...

  3. Absolute value (algebra) - Wikipedia

    en.wikipedia.org/wiki/Absolute_value_(algebra)

    The standard absolute value on the integers. The standard absolute value on the complex numbers.; The p-adic absolute value on the rational numbers.; If R is the field of rational functions over a field F and () is a fixed irreducible polynomial over F, then the following defines an absolute value on R: for () in R define | | to be , where () = () and ((), ()) = = ((), ()).

  4. Positive and negative parts - Wikipedia

    en.wikipedia.org/wiki/Positive_and_negative_parts

    The converse, though, does not necessarily hold: for example, taking f as =, where V is a Vitali set, it is clear that f is not measurable, but its absolute value is, being a constant function. The positive part and negative part of a function are used to define the Lebesgue integral for a real-valued function.

  5. Sign function - Wikipedia

    en.wikipedia.org/wiki/Sign_function

    A subderivative value 0 occurs here because the absolute value function is at a minimum. The full family of valid subderivatives at zero constitutes the subdifferential interval [ − 1 , 1 ] {\displaystyle [-1,1]} , which might be thought of informally as "filling in" the graph of the sign function with a vertical line through the origin ...

  6. Valuation (algebra) - Wikipedia

    en.wikipedia.org/wiki/Valuation_(algebra)

    the value group or valuation group Γ v = v(K ×), a subgroup of Γ (though v is usually surjective so that Γ v = Γ); the valuation ring R v is the set of a ∈ K with v ( a ) ≥ 0, the prime ideal m v is the set of a ∈ K with v ( a ) > 0 (it is in fact a maximal ideal of R v ),

  7. 'As foretold in the prophecy': Elon Musk and internet react ...

    www.aol.com/foretold-prophecy-elon-musk-internet...

    Tesla's stock price reached $420 on Wednesday afternoon, which elicited responses from social media users and the company's CEO, Elon Musk. "As foretold in the prophecy," Musk wrote in an X post ...

  8. FAA announces temporary restrictions on drone flights in New ...

    www.aol.com/news/faa-announces-temporary...

    The Federal Aviation Administration issued temporary flight restrictions prohibiting drone flights over parts of New Jersey following an influx of sightings in recent weeks.. The notice, which ...

  9. Differentiable function - Wikipedia

    en.wikipedia.org/wiki/Differentiable_function

    The absolute value function is continuous (i.e. it has no gaps). It is differentiable everywhere except at the point x = 0, where it makes a sharp turn as it crosses the y-axis. A cusp on the graph of a continuous function. At zero, the function is continuous but not differentiable.