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The #1 most popular question on MO is "Examples of common false beliefs in mathematics".

• The #8 most popular answer is "if a set is open, then it is not closed".

• The #4 most popular answer is "1 + the product of the first n prime numbers is always prime".

• The #2 most popular answer is "the trace of a product of any number of matrices is independent of their order"

Here are verifications that these are indeed false beliefs. :)

The #1 most popular question on MO is "Examples of common false beliefs in mathematics".

• The #8 most popular answer is "if a set is open, then it is not closed".

• The #4 most popular answer is "1 + the product of the first n prime numbers is always prime".

• The #2 most popular answer is "the trace of a product of any number of matrices is independent of their order"

Here are verifications that these are indeed false beliefs. :)

Alternative link since that one may be down

The #1 most popular question on MO is "Examples of common false beliefs in mathematics".

• The #8 most popular answer is "if a set is open, then it is not closed".

• The #4 most popular answer is "the product of the first n prime numbers is always prime".

• The #2 most popular answer is "the trace of a product of any number of matrices is independent of their order"

Here are verifications that these are indeed false beliefs. :)

The #1 most popular question on MO is "Examples of common false beliefs in mathematics".

• The #8 most popular answer is "if a set is open, then it is not closed".

• The #4 most popular answer is "1 + the product of the first n prime numbers is always prime".

• The #2 most popular answer is "the trace of a product of any number of matrices is independent of their order"

Here are verifications that these are indeed false beliefs. :)

The #1 most popular question on MO is "Examples of common false beliefs in mathematics".

• The #8 most popular answer is "if a set is open, then it is not closed".

• The #4 most popular answer is "the product of the first n prime numbers is always prime".

• The #2 most popular answer is "the trace of a product of any number of matrices is independent of their order"

Here are verifications that these are indeed false beliefs. :)

The #1 most popular question on MO is "Examples of common false beliefs in mathematics".

• The #8 most popular answer is "if a set is open, then it is not closed".

• The #4 most popular answer is "the product of the first n prime numbers is always prime".

• The #2 most popular answer is "the trace of a product of any number of matrices is independent of their order"

Here are verifications that these are indeed false beliefs. :)