olemus
kaugust säilitav teisendus T meetrilises ruumis X,
st niisugune teisendus, mille puhul kehtib
d(T(x),T(y)) = d(x,y) ruumi X mis tahes punktide x ja y korral

Wiktionary:
(mathematics) a function between metric spaces (or on a single metric space) having the property that the distance between two images is equal to the distance between their preimages

näiteid
http://www.geometrycommoncore.com/content/unit1/gco2/images/isometric.jpg

https://cviveiros.files.wordpress.com/2008/12/isometry.gif

http://comp.uark.edu/~strauss/symmetry.unit/sym.1.3.isometries.gif

ülevaateid
http://mathworld.wolfram.com/Isometry.html

https://en.wikipedia.org/wiki/Isometry

https://arxiv.org/pdf/1405.3690.pdf

https://sites.millersville.edu/rumble/Math.505/Book/chapter1.pdf