你的能力最好有你自尊心的一半
老庄语：吾生也有涯，而知也无涯。以有涯随无涯，殆已。意思是生命有限，未知辽阔，用有限的生命求知到死。倘若，这条求知的生命恰好是天才，那死的多半比较早，所以就有天妒英才四字。事有蹊跷，这两日难道是与天才电影杠上了？莫名其妙看到《知无涯者》，简言之，故事讲述的是印度数学天才拉马努金与数学家哈代的故事。
开篇，拉马努金住在破庙里，四处找工作糊口，常常无功而返，终有同胞相助获取会计差事一份，效力当时的英国外贸进出口公司。拉马努金妻子登场，对他的笔记本感到好奇。这些是做什么的？我觉得大概就像是绘画吧，只是想象它由看不见的色彩构成。那有什么用处呢？可能对你来说用处不大，但对我来说这是一切。也许会有其他人看到并理解它。你看，水波，光的色彩，万物都有规律，在数学里呈现这些规律，如果你能看到，是很美妙的。拉马努金阐述数学的厉害，顺利获得太太对他的刮目。可见，这是为他俩后面的爱情部分做铺垫。
显然，工作有了着落的拉马努金仍迷于数学。上司及英人老板强烈给他建议，如此高级的知识，应该让全世界人认知。于是，通过书信，拉马努金又前进了一步，成功引起剑桥数学家哈代教授的注意。哈代邀请他前往英伦。母亲焦虑地对拉马努金说，我们是婆罗门教的人，不可以出海。这里提到的婆罗门，属于印度种姓制度最高层，历来是帝王贵族。然而，就拉马努金的境遇看，他们家可能是破落户。婆罗门中人，有对宗教的阐释，寓意族群中人更得神谕青睐。这点在影片尾声会有呼应。
说回拉马努金，在妻子为其削发，立下回家誓言之后，母亲也最终同意其前往剑桥。海港别离，印度洋的风吹起他母亲的沙丽，也鼓动拉马努金笔挺的西服，母亲叮嘱，千万不要吃英国食物，那是不洁的，会遭天谴。尽管，拉马努金旦旦点头，也暗示了他往后的劫难。
海上镜头，同船人与他言，六千英里，多么巨大到难以想象的遥远。拉马努金默默回应，我知道比这更大的数字。（天才的傲娇哪能是普通人能预见的）
画面转换，切自剑桥，哈代在众科学家中游说，力荐漂洋过海即将到来的印度人拉马努金。大家表示并不理解不信任哈代，只有助手支持哈代的执拗。拉马努金匆忙穿过庭院，被同窗拉回绕边行，并向他告知，只有科学家委员会成员才有资格踩踏草坪。不管是在他的家乡印度还是在君主立宪的宗主国英国，也有森严的高低贵贱，即便是在学养深厚的世界一流学府。
哈代对拉马努金的到来感到兴奋渴望，却迟举拉马努金发表论文，无处不表现出数学家特有的严谨治学风格。他本已是享誉世界的知名数学家，依然折服于拉马努金天才神启般的数学理论。试图求证数学的精准，证明天才真的是天才，协助拉马努金反复周旋在三一学院众多数学家之间，以期获得认同。不巧，第一次世界大战爆发，英国卷入战争。拉马努金幸免于直击战事，却不幸于艰难的求证旋涡。间中，妻子的来信被母亲扣押，失联。生活困苦的他屡屡受挫，意志消沉。哈代毫无觉察，拉马努金怒火中烧，身染结核。
影片冗杂，多线叙事不清不楚，毫无重点，混乱令其无聊。与其说是以拉马努金为主的传记片，不如说是哈代与拉马努金携手的日常。师徒之间，亦师亦友，偶有一些玄乎其玄的地方，观众若是数学学渣，就很难理解他俩和三一学院教授们的精彩对撞。
比如，探讨对于素数计数函数 π(x)，有一个比 x/ln(x) 更好的逼近函数 Li(x) 那时计算出的 Li(n) 总是大于 π(n)，因此猜测可能对任意自然数也成立 后来 Littlewood 证明不是这样的，π(n) 可以反超 Li(n)，只不过反超点对应的自然数 n 极其巨大，大概在10的316次方量级，远超那时的计算能力（应该也远超现在的能力）。这就是为什么剧中有一段哈代问拉马努金，你算过几百万，你有算过万亿吗？实际上，哈代极力从严要求他求证理论的精准，因为直觉并不总是可靠的。
再譬如，最终帮助拉马努金获得三一学院院士资格的是他的“整数拆分”，简单的可以理解的拆分是4的划分等于5，就是4的组合方式有五种：1+1+1+1，3+1，2+1+1，2+2，和 4。看起来很简单，但如果把划分数字涨到100，就会有204226种不同的方法。数学家麦克马洪用了几周手算出来，现在能用公式解决，代入任意数就能得出拆分结果，这多么魔性呵。拉马努金最终成功的证明自己，质数定理和整数拆分，通过简洁公式将数的规律找到和演算。
拉马努金对自己的天赋认知，影片传达的是他对神的赤诚，当他带着荣誉回到印度，一年之后，哈代收到他去世的消息，悲恸不已。如果没有哈代，拉马努金穷其一生，也许也只是活在印度市井中的普通职员。活着的拉马努金可以任性地穿越草坪不再受到指责，不知死去的拉马努金有没有预见到他当时的数学理论，百年之后才应用到宇宙黑洞的研究中。
最后，带有主观偏见，饰演哈代的Jeromy Irons一如既往不错；对饰演拉玛努金的英籍印度裔DevPatel印象还停留在贫民窟的百万富翁中，毫无亮色。可以说，《知无涯者》我给及格 分，而触动最深的，则数英国老板对拉玛努金的那句：你的能力最好有你自尊心的一半。
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