PlanetMath (more info)
 Math for the people, by the people.
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$x^4-y^4=z^2$ has no solutions in positive integers owned by rm50
$(-x)\cdot (-y)= x\cdot y$ (=law of signs under multiplication in a ring) owned by alozano
$x$-intercept (in line in plane) owned by matte
x-intercept (=line in plane) owned by matte
XML owned by yota
$x$ to the $x$th power (=function $x^x$) owned by pahio
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