In contrast, Proneural and other tumors with low PDGF-A expression may utilize or be selected for a different mechanism to activate PDGF signaling despite the low levels of PDGF-A expression, such as upregulation of PDGF-B [48] or amplification of PDGFR [36], without the repression of TMEFF2.
An association rule is an expression, such as A ≥ B, where A and B are item sets.
The multinomial theorem provides a formula for expanding an expression such as (x1 + x2 +⋯+ xk)n for integer values of n.
If it were possible for a given sortal, such as sword, sometimes to be an ultimate sortal and sometimes a phase sortal, it is not clear how such an expression would differ from an expression such as brown thing, which may or may not characterize something through the whole of its existence.
Specifically, Frege's Axiom V requires that an expression such as φ(x) be considered both a function of the argument x and a function of the argument φ. (More precisely, Frege's Law states that the course-of-values of a concept f is identical to the course-of-values of a concept g if and only if f and g agree on the value of every argument, i.e., if and only if for every object x, f(x) = g(x).
In an expression such as plur child), both the plur operator, which transforms a predicate into another predicate, and the resulting collective predicate, are of nonstandard types.
If used in a program context that requires (f,o) to be of type (Int)—in an expression such as, for example, (f,o) + (1 Int) —overloadings of (f) and (o) in (f,o) are resolved, with (f) and (o) having types (Int,rightarrow Int) and (Int,) respectively.
These possibilities include, but are not unique, an expression such as: 2mathrm{Z}mathrm{r}{mathrm{O}}_2+2mathrm{NaOH}+2mathrm{S}mathrm{i}{mathrm{O}}_2=mathrm{N}{mathrm{a}}_2mathrm{Z}{mathrm{r}}_2mathrm{S}{mathrm{i}}_2{mathrm{O}}_9+{mathrm{H}}_2mathrm{O}.
