In any given sentence, all of the nonlogical terms may be replaced by variables of the appropriate type, keeping only the logical constants intact.
The static values can be replaced by variables, and thus the presented image, as well as the image's size, can be made variable (this will result in the object being hidden from the drawing tool, with the message that the sketchpad contains a variably defined object): Conditional statements, commonly referred to as "if" statements, can be used to add even more flexibility to the GUI.
In contrast, in embryophytes (land plants), the strict AAUAAA element becomes a minor component and is replaced by variable A-rich sequences.
Thus, ∼M12 ∨... ∨ ∼M89 is a tautology, and this remains true if 1, 2,..., 9 are replaced by variables, such as r, s,..., z; hence, ∼Mrs ∨... ∨ ∼Myz, being a tautology expressed in the predicate calculus as usually formulated, is a theorem in it.
More generally, this variable abstraction/instantiation process allows us to view a LTL formula as a point in the QFLTL formula space ℝ q, where q is the number of constants appearing in ϕ (or the number of constants that are replaced by variables, if not all constants are abstracted away).
These correlations show that the two variables λ and Γ can be replaced by one variable, V or uw, and they therefore indicate that the waves are isolated from each other.
In contrast to the exponential-type viscous relaxation models, the convolution operator in the Johnson Koplik Dashen dynamic permeability model cannot be replaced by memory variables satisfying first-order relaxation differential equations.
The contribution of this variable cannot be replaced by the AP variable.
Then, two response variables can virtually be replaced by one single variable constructed to best explain the correlation between the two responses.
It enables the original variables to be replaced by new synthetic variables (factors).
Kinetics are described by a set of coupled ordinary differential equations which implicitly assume (i) that the reaction compartment is so large that molecular discreteness can be ignored and that hence integer numbers of molecules per unit volume can be replaced by a continuous variable, the molar concentration.
