less than 100 years ago Dalton published his theory that atoms could not be broken down into smaller particles. Scientist have found out that they can in fact be broken down even further.
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Dalton thought that atoms could not be subdivided. Today we know that all of the subatomic particles can and do exist separately.
One possible conjecture is that the product of two odd integers is 8. A conjecture does not have to be true, nor does it have to be sensible. It must be testable, though. Many conjectures were initially thought to be sensible and true but later proven to be false. And when the false nature is fully understood, in retrospect they no longer appear sensible either!
In a way, yes. Certain "postulates" or "axioms" are assumed to be true; all other statements are derived from those. The "postulates" are chosen so that they are reasonable and simple assumptions.If you try to prove the postulates, you have to derive them from some other statements, so sooner or later, you will always have unproved statements. That can't be avoided.In a way, yes. Certain "postulates" or "axioms" are assumed to be true; all other statements are derived from those. The "postulates" are chosen so that they are reasonable and simple assumptions.If you try to prove the postulates, you have to derive them from some other statements, so sooner or later, you will always have unproved statements. That can't be avoided.In a way, yes. Certain "postulates" or "axioms" are assumed to be true; all other statements are derived from those. The "postulates" are chosen so that they are reasonable and simple assumptions.If you try to prove the postulates, you have to derive them from some other statements, so sooner or later, you will always have unproved statements. That can't be avoided.In a way, yes. Certain "postulates" or "axioms" are assumed to be true; all other statements are derived from those. The "postulates" are chosen so that they are reasonable and simple assumptions.If you try to prove the postulates, you have to derive them from some other statements, so sooner or later, you will always have unproved statements. That can't be avoided.
This question is unanswerable. How can a "statement of truth" be made which "is not true". Truth does not change. It cannot be that something was true when it was said and later it became untrue.
False. Erosion control should begin before the first evidence of erosion. When building bridges over waterways, construction contractors are already devising ways to control erosion so the bridge does not fall into the water later on.
my flight will come an hour later