Which of the statements are obviously true? Which ones require more thought to determine their truthfulness?
this is the statements:
the sun is the center of the solar system
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The only general expression is “obvious truth”.
Also, true logical implications that are indeed obviously true are called “logical truth”, essentially because they are true in all cases.
We know a logical truth is true only because it is obviously true, like the Modus ponens or De Morgan’s laws. This is the only way we have because there is no formal method to decide in the general case whether an implication is true or not.
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