When referring to a planar object, "fixed" means that the object is regarded as fixed in the plane so that it may not be picked up and flipped. As a result, mirror images are not necessarily equivalent for fixed objects.

# Fixed

## See also

Free, Mirror Image## Explore with Wolfram|Alpha

## Cite this as:

Weisstein, Eric W. "Fixed." From *MathWorld*--A
Wolfram Web Resource. https://mathworld.wolfram.com/Fixed.html