Garner
Lower-triangular Matrix A square matrix A whose elements aij=0 for i
A capacitor whose dielectric material consists of oiled paper sandwiched between two layers of metallic foil.
Uper-triangular Matrix A square matrix A whose elements aij=0 for i>j is called upper triangular matrix.
Lewis
An audile is a person whose mental imagery consists of sounds.
chitons
Suffrage.
what column of the periodic table contains elements whose electron configurations end with d4
U2
A subset of some set X is, by definition, any set whose elements are entirely contained in X. So the answer is yes. As an example, take your infinite set, and select 3 or 10 or any finite number of your favorite elements in this set. The set of your chosen elements is a finite subset of the infinite set.
A finite set or a countably infinite set.
Elements