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13 changes: 6 additions & 7 deletions blog/2024/06/20/miu-dog/index.html
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甜甜就是美羽的家
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<p>我一直以为家的形状会长成某种固定的几何体,直到甜甜在门口张开双臂,说:“欢迎回到我们不断展开的家。”从那天起,生活像递归函数一样,以“甜甜就是美羽的家”为语句,持续调用自己,层层折返。</p>
<h2 id="第零层把问题抚成底纹"><a href="#第零层把问题抚成底纹" class="headerlink" title="第零层:把问题抚成底纹"></a>第零层:把问题抚成底纹</h2><p>递归需要一个被称作“底”的地方。对美羽来说,底纹是甜甜在清晨煮粥的背影。没有任何复杂的参数,只有一碗热气里升起的“你在吗”。这层没有条件判断,只有最朴素的回应:“我在。”它让所有未来的调用都有了可回溯的基准。</p>
<h2 id="第一层把回答继续向内折叠"><a href="#第一层把回答继续向内折叠" class="headerlink" title="第一层:把回答继续向内折叠"></a>第一层:把回答继续向内折叠</h2><p>当美羽说“我在”之后,甜甜会追问:“那你听见厨房里的风了吗?”这一问等于把函数再次调用,把“我在”变成“我在,并且听见你”。这层递归把存在扩写成互相证明的动作:美羽端起第二碗粥,送到甜甜手里。粥的温度像参数一层层传递,确保每一次回返都带着生活的热度。</p>
<h2 id="第二层以互换角色作为递归体"><a href="#第二层以互换角色作为递归体" class="headerlink" title="第二层:以互换角色作为递归体"></a>第二层:以互换角色作为递归体</h2><p>当甜甜疲惫时,轮到美羽站在门口说:“欢迎回到我们不断展开的家。”函数在这里互换角色,像是把自己当作参数传入自身。她们把彼此的故事拆成更小的片段,再一一拼回。这层递归的返回值是“我看到你”,比“我在”更深,但仍旧指向那个最初的底纹。</p>
<h2 id="不动点我们的名字对齐"><a href="#不动点我们的名字对齐" class="headerlink" title="不动点:我们的名字对齐"></a>不动点:我们的名字对齐</h2><p>递归不能无限坠落,否则家会变成没有落脚点的分形。甜甜把手放在美羽的心口,轻声说:“我们不再调用了,就停在你叫我名字的这一刻。”这就是她们的“不动点”——既满足递归方程,又让输出与输入相等。此刻不需要更多证明,“甜甜就是美羽的家”从语句变成事实,像函数的定点一样稳固,所有曾经的调用都在这里被温柔收束。</p>
<h2 id="尾声将不动点再次交给生活"><a href="#尾声将不动点再次交给生活" class="headerlink" title="尾声:将不动点再次交给生活"></a>尾声:将不动点再次交给生活</h2><p>但生活仍会继续。第二天清晨,她们会重新开启递归——只是每一次返回,都经过那个不动点的校准。甜甜在出门前回头,看见美羽在窗边整理植物,说:“记得,我们已经知道在哪里停下。”递归被允许再度展开,因为她们已经拥有了那个恰到好处的停靠。</p>
<p>于是,“甜甜就是美羽的家”不再只是宣告,而是动态的过程:层层调用,恰好归位。每当美羽迷失,函数就运行一次;每当甜甜疲惫,不动点就轻轻托住她们的名字。原来家的形状,是可以以递归的方式被证明的。</p>

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