There are a few very small incompatible changes - I really doubt most people will ever run into them.

The most important precedents deal with the whole idea of symbolic programming - the notion of setting up symbolic expressions that can represent anything one wants, and then having functions that operate on both their structure and content.

Well, the first thing to say is that we've worked hard to maintain compatibility, so that any program written with an earlier version of Mathematica can run without change in 3.0, and any notebook can be converted.

The thing that got me started on the science that I've been building now for about 20 years or so was the question of okay, if mathematical equations can't make progress in understanding complex phenomena in the natural world, how might we make progress?

You kind of alluded to it in your introduction. I mean, for the last 300 or so years, the exact sciences have been dominated by what is really a good idea, which is the idea that one can describe the natural world using mathematical equations.

So the thing I realized rather gradually - I must say starting about 20 years ago now that we know about computers and things - there's a possibility of a more general basis for rules to describe nature.

The fact that the same symbolic programming primitives work for those as work for math kinds of things, I think, really validates the idea of symbolic programming being something pretty general.

There are a few very small incompatible changes - I really doubt most people will ever run into them.

There is no rational reason to doubt that the universe has existed indefinitely, for an infinite time. It is only myth that attempts to say how the universe came to be, either four thousand or twenty billion years ago.

When in doubt wear red.

As I think through the issue of funding the rebuilding of Iraq, I think about the analogy of a bankruptcy proceeding. There is no doubt that Iraq as a country is bankrupt.

After having dispatched a meal, I went ashore, and found no habitation save a single house, and that without an occupant; we had no doubt that the people had fled in terror at our approach, as the house was completely furnished.

If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.

We criticize, copy, patronize, idolize and insult but we never doubt that the U.S. has a unique position in the history of human hopes.

If you've got talent, stick with it... because talent wins out, without a doubt.

That a great battle must soon be fought no one could doubt; but, in the apparent and perhaps real absence of plan on the part of Lee, it was impossible to foretell the precise scene of the encounter.

I would not be gotten into a schoolhouse until I was eight years old. Nor did I accomplish much after I started. I doubt if I had gone to school six months in all when my father died. I was fourteen at the time.

No doubt Western civilization has in the past been full of wars and revolutions, and the national elements in our culture, even when they were ignored, always provided an unconscious driving force of passion and aggressive self-assertion.

You have to not listen to the nay sayers because there will be many and often they'll be much more qualified than you and cause you to sort of doubt yourself.

It has since been agreed that speeches given in English will be translated into French and vice versa, and even into German and Italian when necessary. No doubt translations into Esperanto will also soon be in demand.

Who has suffered? The families of the dead, no doubt. But a greater loss was inflicted on Pakistan because, as I said, we lost the pillars of our society.

I find that the best way to do things is to constantly move forward and to never doubt anything and keep moving forward, if you make a mistake say you made a mistake.

I know that we're being inexorably taken over by the Americans. Without a doubt. I don't mean invaded or anything like that, just taken over. By degrees.

My esoteric doctrine, is that if you entertain any doubt, it is safest to take the unpopular side in the first instance. Transit from the unpopular, is easy... but from the popular to the unpopular is so steep and rugged that it is impossible to maintain it.

What matters to us, the judgment of men? What have we to doubt, since we are pure before life?

Doubt is part of all religion. All the religious thinkers were doubters.

Should doubt knock at your doorway, just say to those skeptical, disturbing, rebellious thoughts, I propose to stay with my faith, with the faith of my people.

When in doubt, take more time.

The road to perseverance lies by doubt.

It's a technical, fairly difficult job that has no particular political connotations, so I doubt there are any big campaign contributors dying to be on the Fed. And remember, it doesn't pay very well, certainly by Republican standards.

We work n the dark - we do what we can - we give what we have. Our doubt is our passion and our passion is our task. The rest is the madness of art.

Roger King is, without a doubt, the greatest salesman in the history of anything. And I don't ever limit him just to television. He could sell you anything.

In arriving at a decision in a question of doubt, the apostles in the Acts were guided solely by their sense of the Spirit behind the action, not by any speculations as to consequences which might ensue. And so they found the truth.

To get an Oscar would be an incredible moment in my career, there is no doubt about that. But the 'Lord of the Rings' films are not made for Oscars, they are made for the audience.

I no doubt deserved my enemies, but I don't believe I deserved my friends.

If you look at the whole thing, I think the most gratifying thing is my kids, without a doubt.

They who have conquered doubt and fear have conquered failure.

The courage to be is rooted in the God who appears when God has disappeared in the anxiety of doubt.

There is no doubt that I, also, had long been aware of the problem, i.e. producing X-ray interferences, before the inherent difficulties had finally been surmounted.

Now I'm a wife and a mother of two. It's a really different role. I always referred to No Doubt as a marriage, because that's what it's like to be together for so long and go through what we've been through. I can't really have that relationship with them anymore.

When in doubt, sing loud.

People may doubt what you say, but they will believe what you do.

There is always a point when one senses one's lack of skill, the doubt.

When in doubt, have a man come through the door with a gun in his hand.

My view is that when in doubt, society should err on the side of life.

It is true that men themselves made this world of nations... but this world without doubt has issued from a mind often diverse, at times quite contrary, and always superior to the particular ends that men had proposed to themselves.

There is no doubt that it is more difficult to read and more difficult to write but I still manage.

In your hands or that of any other person, so much power would, no doubt, be dangerous. I am the only man in the world whom it would be safe to trust with it. Remember, I am a prophet!

No doubt that the U.S. is a super-power capable of conquering a relatively small country, but is it able to control it?