Plot of f defined as
<p><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle f(x)=\operatorname {sgn} \left(w(x)\right)\log \left(1+|w(x)|\right)\!}"><semantics><mrow class="MJX-TeXAtom-ORD"><mstyle displaystyle="true" scriptlevel="0"><mi>f</mi><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo><mo>=</mo><mi>sgn</mi><mo>⁡<!-- ⁡ --></mo><mrow><mo>(</mo><mrow><mi>w</mi><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo></mrow><mo>)</mo></mrow><mi>log</mi><mo>⁡<!-- ⁡ --></mo><mrow><mo>(</mo><mrow><mn>1</mn><mo>+</mo><mrow class="MJX-TeXAtom-ORD"><mo stretchy="false">|</mo></mrow><mi>w</mi><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo><mrow class="MJX-TeXAtom-ORD"><mo stretchy="false">|</mo></mrow></mrow><mo>)</mo></mrow><mspace width="negativethinmathspace"></mspace></mstyle></mrow><annotation encoding="application/x-tex">{\displaystyle f(x)=\operatorname {sgn} \left(w(x)\right)\log \left(1+|w(x)|\right)\!}</annotation></semantics></math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/14aa53832f9accfcb72eac45fd55ba6326a7b479" class="mwe-math-fallback-image-inline" aria-hidden="true" style="vertical-align: -0.838ex; margin-right: -0.166ex; width:32.547ex; height:2.843ex;" alt="f(x)=\operatorname{sgn} \left(w(x)\right)\log \left(1+|w(x)|\right)\!"></span>
</p>
where w(x) is Wilkinson's polynomial.
<a href="//commons.wikimedia.org/wiki/User:Krishnavedala" title="User:Krishnavedala">Krishnavedala</a>
2011-06-12
<span class="int-own-work" lang="en">Own work</span>