However, Montgomery makes little contribution to leadership theory and practice.

While casuistry makes use of ethical theory, it does not view ethical theory as the most important feature of moral reasoning.

For example, the Riemann hypothesis is a conjecture from number theory that ( amongst other things ) makes predictions about the distribution of prime numbers.

The classification of groups of small 2-rank, especially ranks at most 2, makes heavy use of ordinary and modular character theory, which is almost never directly used elsewhere in the classification.

What makes the Lettre sur les aveugles so remarkable, however, is its distinct, if undeveloped, presentation of the theory of variation and natural selection.

Traditionally, normative ethics ( also known as moral theory ) was the study of what makes actions right and wrong.

However, Russell's theory analyses proper names into a logical structure which makes sense of this problem.

The complexity of these interactions makes the calculation of friction from first principles impossible and necessitates the use of empirical methods for analysis and the development of theory.

Researchers in experimental finance can study to what extent existing financial economics theory makes valid predictions, and attempt to discover new principles on which such theory can be extended.

It makes a close link between model theory that deals with what is true in different models, and proof theory that studies what can be formally proved in particular formal systems.

Also, it makes the concept of " provability " and thus of " theorem ", a clear concept that only depends on the chosen system of axioms of the theory, and not on the choice of a proof system.

In category theory, a branch of mathematics, a Grothendieck topology is a structure on a category C which makes the objects of C act like the open sets of a topological space.

Furthermore, the classification of covering spaces makes strict reference to particular subgroups of, specifically distinguishing between isomorphic but conjugate subgroups, and therefore amalgamating the elements of an isomorphism class into a single featureless object seriously decreases the level of detail provided by the theory.

Einstein's theory of special relativity, like Newtonian mechanics, assumes the equivalence of all inertial reference frames, but makes an additional assumption, foreign to Newtonian mechanics, namely, that in free space light always is propagated with the speed of light c < sub > 0 </ sub >, a defined value independent of its direction of propagation and its frequency, and also independent of the state of motion of the emitting body.

Lie groups represent the best-developed theory of continuous symmetry of mathematical objects and structures, which makes them indispensable tools for many parts of contemporary mathematics, as well as for modern theoretical physics.

In other set theories, such as New Foundations or the theory of semisets, the concept of " proper class " still makes sense ( not all classes are sets ) but the criterion of sethood is not closed under subsets.

Classical measure theory makes deep usage of the axiom of choice, which is fundamental to, first, distinction between measurable and non-measurable sets, the existence of the latter being behind such famous results as the Banach – Tarski paradox, and secondly the hierarchies of notions of measure captured by notions such as Borel algebras, which are an important source of intuitions in set theory.

The theory is complicated by the etymology of the name Svafrþorinn ( þorinn meaning " brave " and svafr means " gossip ") ( or possibly connects to sofa " sleep "), which Rudolf Simek says makes little sense when attempting to connect it to Njörðr.

Oligopoly theory makes heavy use of game theory to model the behavior of oligopolies:

-- On the basis of a differentiability assumption in function space, it is possible to prove that, for materials having the property that the stress is given by a functional of the history of the deformation gradients, the classical theory of infinitesimal viscoelasticity is valid when the deformation has been infinitesimal for all times in the past.

It is possible to prove many theorems using neither the axiom of choice nor its negation ; such statements will be true in any model of Zermelo – Fraenkel set theory ( ZF ), regardless of the truth or falsity of the axiom of choice in that particular model.

In class theories such as Von Neumann – Bernays – Gödel set theory and Morse – Kelley set theory, there is a possible axiom called the axiom of global choice which is stronger than the axiom of choice for sets because it also applies to proper classes.

Perhaps ( as in Kennick's theory ) no definition of art is possible anymore.

The question eventually became the focal point for a philosophical issue ( the theory of possible worlds ) and a theological topic on the distinction between God's absolute power ( potentia absoluta ) and His ordained power ( potentia ordinata ).

However, the argument concludes that the conceptual challenge of bare particulars leaves a bundle of properties and nothing more as the only possible conception of an object, thus justifying bundle theory.

This overcomes the limitations of classical control theory in more sophisticated design problems, such as fighter aircraft control, with the limitation that no frequency domain analysis is possible.

A key distinction between analysis of algorithms and computational complexity theory is that the former is devoted to analyzing the amount of resources needed by a particular algorithm to solve a problem, whereas the latter asks a more general question about all possible algorithms that could be used to solve the same problem.

According to dot-com theory, an Internet company's survival depended on expanding its customer base as rapidly as possible, even if it produced large annual losses.

Microeconomics theory considers the aggregates ( the sum of ) of quantity demanded by buyers and quantity supplied by sellers, studying each possible price per unit ( i. e. supply and demand ).

However, one of the consequences of Einstein's theory is that there is no possible physical test that can distinguish between a beam of light as a model of a geometrical line and any other physical model.

* The third stratum is metalogical, what he called a " theory of all possible forms of theories.

" It explores all possible theories in an a priori fashion, rather than the possibility of theory in general.

In many-worlds, the subjective appearance of wavefunction collapse is explained by the mechanism of quantum decoherence, which resolves all of the correlation paradoxes of quantum theory, such as the EPR paradox and Schrödinger's cat, since every possible outcome of every event defines or exists in its own " history " or " world ".

In probability theory, the expected value ( or expectation, or mathematical expectation, or mean, or the first moment ) of a random variable is the weighted average of all possible values that this random variable can take on.

Living intermediates show that the evolution proposed by the endosymbiont theory is possible.

Aristotle's explanation of how this was possible, was not strictly empiricist in a modern sense, but rather based on his theory of potentiality and actuality, and experience of sense perceptions still requires the help of the active nous.

We believe, however, that such a theory is possible.

The Sahara pump theory ( describing an occasionally passable " wet " Sahara Desert ) provides one possible explanation of the early variation in the genus Homo.

With the possible exception of gravitation, these interactions can usually be described in a set of calculational approximation methods known as perturbation theory, as being mediated by the exchange of gauge bosons between particles.

In 1977, a paper on Heim theory theorized that it may be possible to travel faster than light by using magnetic fields to enter a higher-dimensional space.

The possibility that Lorentz symmetry may be violated has been seriously considered in the last two decades, particularly after the development of a realistic effective field theory that describes this possible violation, the so-called Standard-Model Extension.

One theory states that stable wormholes are possible, but that any attempt to use a network of wormholes to violate causality would result in their decay.