singular transformation

singular transformation

[′siŋ·gyə·lər tranz·fər′mā·shən]
(mathematics)
A linear transformation which has no corresponding inverse transformation.
References in classic literature ?
Since Aramis's singular transformation into a confessor of the order, Baisemeaux was no longer the same man.
A little before any of these, Outcault had published in the Sunday supplement of the New York World a colored sequence that in six boxes unfolded the singular transformation of an anaconda that swallowed a succulent yellow dog.