Skepticism is a philosophical school of thought that questions the possibility of certain knowledge. Skeptics argue that our senses are unreliable and that our beliefs are based on faith or opinion rather than on solid evidence.

The Dream Argument, the Evil Demon Argument, and the Matrix Argument are all skeptical arguments that attempt to show that we cannot be certain of anything we experience.

Foundationalism is a philosophical theory that holds that there are certain basic beliefs that are self-evident and cannot be doubted. These beliefs are then used to justify other beliefs.

René Descartes is the philosopher most closely associated with foundationalism. He argued that the only thing we can be certain of is our own existence, and that all other beliefs must be justified by reference to this basic belief.

The main problem with foundationalism is that it is circular. In order to justify our basic beliefs, we must rely on other beliefs, and so on. This leads to an infinite regress, which means that we can never be certain of anything.

Immanuel Kant is the philosopher most closely associated with coherentism. He argued that the truth of a belief is determined by its coherence with other beliefs.

The main problem with coherentism is that it is too broad. It allows for the possibility that contradictory beliefs can be true, as long as they are coherent with each other.

William James is the philosopher most closely associated with pragmatism. He argued that the truth of a belief is determined by its practical consequences.

The main problem with pragmatism is that it is too narrow. It only considers the practical consequences of a belief, and not its truth or falsity.

Academic skepticism is not a type of skepticism. It is a school of thought that holds that we should suspend judgment on all matters of belief.

Methodological skepticism is more radical than Pyrrhonian skepticism because it holds that we should not even try to form beliefs, while Pyrrhonian skepticism only holds that we should suspend judgment on our beliefs.

The Problem of Evil is a skeptical argument against the existence of God that asks why an all-powerful, all-good God would allow evil to exist.

The Dream Argument, the Evil Demon Argument, and the Matrix Argument are all skeptical arguments that attempt to show that we cannot be certain of anything we experience.

The main conclusion of skepticism is that we can know nothing. Skeptics argue that our senses are unreliable and that our beliefs are based on faith or opinion rather than on solid evidence.

The main problem with skepticism is that it is self-refuting. If we cannot know anything, then we cannot know that we cannot know anything. This leads to a contradiction.