Darwin's theory of evolution by natural selection.

And he was reading Einstein's recently published general theory of relativity, and he was thrilled by this theory.

A delightful theory. A dangerous theory.

But that is not supported by theory or experience.

Three years later the theory was confirmed by observations.

This can be explained by Darwin's theory of evolution.

And that's what we mean by a unified theory.

Dual coding theory, a theory of cognition, was hypothesized by Allan Paivio of the University of Western Ontario in 1971.

This is called a cognitive hierarchy theory, by the way.

Motivation from ergodic theory Some of the theory developed by Alain Connes to handle noncommutative geometry at a technical level has roots in older attempts, in particular in ergodic theory.

I'm a biologist, and the central theorem of our subject the theory of design, Darwin's theory of evolution by natural selection.

And that theory, we think, is String Theory.

The God theory is not just a bad theory.

Number theory is the theory of the positive integers.

The God theory is not just a bad theory.

In theory, no prime number is not a theory.

String theory, we think, is a theory of everything.

My theory?

What theory?

Is this proposition true? Is this theory a good theory?

Relational patterns of interaction theory Relational Patterns of Interaction Theory of the cybernetic tradition, studies how relationships are defined by peoples interactions during communication.

In the theory of quantum mechanics fermions are described by antisymmetric states.

The best bound, ℵω4, was obtained by Shelah using his pcf theory.

So, the big brain, on this theory, is driven by the memes.

The first development of set theory was a naive set theory.

And deterrence theory is a very simple theory of human behavior

In the 1990s it was realized by Edward Witten (building on previous insights by Michael Duff, Paul Townsend, and others) that the limit of type IIA string theory in which the string coupling goes to infinity becomes a new 11 dimensional theory called M theory.

Social Learning Theory .

'Theory of mind'

Here's Andy's theory.

The Quantum Theory

The quantum theory

Oh, my theory.

What's your theory?

What's that theory?

That's mere theory.

Theories Ecological systems theory Also called development in context or human ecology theory, ecological systems theory, originally formulated by Urie Bronfenbrenner specifies four types of nested environmental systems, with bi directional influences within and between the systems.

Number theory Farisi made a number of important contributions to number theory.

It was begun with the invention of relativity theory and quantum theory.

If you think you understand quantum theory, you don't understand quantum theory.

We need a higher theory, and that's where string theory comes in.

But Keynes s theory was incomplete his was a theory of employment, interest, and money. It was not a theory of prices.

I came up with this new theory and by the way, it's copyright.

The path goal theory, also known as the path goal theory of leader effectiveness or the path goal model, is a leadership theory developed by Robert House, an Ohio State University graduate, in 1971 and revised in 1996.

Their theory is called BET theory, after the initials in their last names.