If someone does not believe in fairies, he does not need to teach his children 'There are no fairies'; he can omit to teach them the word 'fairy'.
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About Ludwig Wittgenstein
Ludwig Wittgenstein was a 19th-century Austrian philosopher and logician. Ludwig Josef Johann Wittgenstein was an Austro-British philosopher who worked primarily in logic, the philosophy of mathematics, the philosophy of mind, and the philosophy of language. Read more on Wikipedia →