https://yh.timefriend.vip/tags/math/Recent content in Math on YaohongHugoen-usThu, 29 Oct 2020 07:57:20 +0800https://yh.timefriend.vip/post/math/limitstoinfinity/Thu, 29 Oct 2020 07:57:20 +0800https://yh.timefriend.vip/post/math/limitstoinfinity/<h1 id="understanding-limits-to-infinity">Understanding limits to infinity</h1> <p>When <code>x-&gt;∞</code>, what is the exact number of x?</p> <p>We don&rsquo;t know, x is undefined.</p> <p><code>∞</code> is not a number, is a idea of having a greater number than you give.</p> <p>When <code>x-&gt;∞</code>, <code>1/x</code> appoachs zero, but is never equal zero!</p> <p>When <code>n -&gt; ∞</code>, does <code>sin(1/n) / (1/n)</code> have meaning?</p> <p>I used to thought <code>1/n = 0</code> while <code>n-&gt;∞</code>, but 0 cannot be divided, So I was confused.</p>