In <What Is Life?>, written by Lynn Margulis and Dorion Sagan, there is an expression, “Independence is a political term, not a scientific term.” Independence is the state in which a person can live alone without help or influence from others, using their own strength and ability. The condition of being physically separated from the community is called “isolation.” Independence and isolation are different. Isolation should not be mistaken for independence. To exclude influence and secure autonomy is independence, while deliberately cutting off relationships is isolation. Independence is based on achievement; isolation is based on hurt. To grow, you must be independent, not isolated. - Joseph’s “just my thoughts”
"Apples are the fruit" is a true proposition. At this time, "apples" are a Sufficient Condition to be fruit, and vice versa, because the "fruit to be an apple is more necessary for other conditions such as "red, round", the fruit is a Necessary Condition to become an apple. If the proposition of "If you respect someone, you'll get married" is "true," it's a "Sufficient Condition" to find someone you admire for marriage, but it's just only a "Necessary Condition" to find someone to marry for respect. Even with respect, you can not get married. You can't get married even if the Reverse Proposition is "true." Because marriage is a matter of "choice" before conditions or needs. If you want a respectable man, you can find a great man. To live comfortably, you can find a rich man. So, is there no Necessary-Sufficient Proposition for a marriage (conditions where both the proposition ...