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But the opposite of zero is well defined: One can admit that zero has no sign. Thank you for your interest in this question. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count. Would you like to answer one of these unanswered questions instead?
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Does negative zero exist? Lienhua 66 1 1 4. Is there positive zero? I dashed off an impassioned email to the teacher, insisting that the result had to be undefined. The most recent version of the standard was completed in but the original version was issued in , so this behavior is not new. Python on the Mac supports negative zero for floats, but throws an exception when you attempt to divide by zero of any sign.
There are a couple of surprising corollaries to these rules:. Infinity is not a number, like zero or 3. Rather, infinity is a concept.
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Furthermore, from a number theory perspective, division by zero is nonsensical. You can understand why if you get precise about what division means. Because this type of person is more likely to be female than male, Baron-Cohen defines them as having an extreme female brain.
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A second book about altruism is due to be published later this year: Pathological Altruism, edited by Barbara Oakley et al. It's a collection of essays focusing on the downside of empathy-fuelled altruism, and Baron-Cohen has contributed a chapter on the extreme female brain. This personality type is a candidate for maladaptive altruism because the more empathic one is the more the needs of others are prioritised over the needs of self. I was surprised that Satoshi Kanazawa 's contribution to this collection — "Battered women, happy genes: There is no such thing as altruism, pathological or otherwise" — made it to the final edit.
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An extreme altruist rarely complains, because they do not want to burden others, and as they are not egocentric they do not advertise their altruistic actions. As a result these personality types are usually off the psychology radar. To claim there is "no such thing" is just plain arrogant. Kanazawa's point is derived from a single perspective, namely that there is some evidence that a battered woman is more likely to bear sons, which gives her genes an evolutionary advantage.
This is why women stay in damaging relationships, he claims. But this simple analysis appears to be born out of zero-positive systemising, as Baron-Cohen might put it, because it lacks both depth and breadth of empathic insight. The drives of battered women are far more nuanced and complex than this.