*Kernel* occurs in English in 1909 in *Introd. Study Integral
Equations* by M. B瀿her: "K is called the kernel of these equations"
(OED2).

**KERNEL (elements mapped into identity element)** is found in English
in 1946 in E. Lehmer's translation of *Pontrjagin's Topological Groups*
(OED2).

**KITE** appears as a geometric term in the 1893 *Funk and Wagnalls
Standard Dictionary.*

**KLEIN BOTTLE** occurs in C. Tompkins, "A flat Klein bottle isometrically
embedded euclidean 4-space," *Bull. Am. Math. Soc.* 47, 508 (1941).

The term **KRONECKER DELTA** is found in 1926 in *Riemannian Geometry*
by Luther Pfahler Eisenhard: "These are called the Kronecker deltas and
are used frequently throughout this work." [Joanne M. Despres of Merriam-Webster
Inc.]

**KURTOSIS** was used by Karl Pearson in 1905 in *Biometrika*
IV. 181 in the phrase "the degree of kurtosis." He states therein that
he has used the term previously (OED2).