What is a function (of an object or an idea)? I once read that functions are

What is a function (of an object or an idea)? I once read that functions are

What is a function (of an object or an idea)? I once read that functions are conventional or "artificial". I can understand that an ashtray has its function (being a place to put cigarette ash) only if we assign it to it, but the function of our hearts (to pump blood) seems quite more natural.

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