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Best Telesteps 16S Combiladder 300-Pound Duty Rating 12-1/2-Foot Stepladder and 12-1/2-Foot Extension Ladder The Best Quality

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Kind polymorphism – a draft

I extended the post on kind polymorphism to Omega, and I’m rather satisfied – I captured 10 different senses of monoids, used level polymorphism and type functions on the way.

sumMonoid      :: Monoid Hask Int                 -- monoid
maybeMonad :: Monoid EndHask Maybe -- monad
envComonad :: Monoid CoEndHask (Env s) -- comonad
haskCat :: Monoid Graph (->) -- category
ixState :: Monoid Indexed IxState -- indexed monad
ixStore :: Monoid CoIndexed IxStore -- indexed comonad
intRing :: Monoid Ab Int -- ring
sumCMonoid :: Monoid Monoids Int -- commutative monoid
complexAlgebra :: Monoid (VSpaces Float) Complex -- R-algebra
EndHask'' :: Monoid' Cats (*0 ~> *0) -- monoidal category

A draft is available here and Omega source code is available here. There are still things that can be improved and researched on.

Also, see a new paper on kind system: Giving Haskell a Promotion. Continua a leggere

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放大你的世界

《联合早报–四方八面》 2011年10月26日

最近发现我有几位朋友钻入了牛角,小小的事情,左思右想,把自己的世界越想越小,逃不出来。

朋友A因担心女儿小六会考考不好,患上了忧抑症。考试期间,白天需服镇静剂才能工作,晚上则要吃安眠药才能入睡;即使会考之后,她仍松懈不下来,成日忧心忡忡。另一位朋友S,儿子考上了本地大学, 但不是第一志愿,又觉得把他送出国念书太昂贵,所以很不开心。

看到他们面瘦肌黄,日日愁眉不展,做什么事情都提不起精神,我也颇为担心。

问A,女儿成绩真的不好么?她说,其实女儿聪明,也早被一所很不错,又有机会直通高中的中学录取了,但这不是她的理想学校,觉得女儿应可争取到更好的。

问S,儿子学系不好么?他说,这只是普通学科,不是专业,担心以后找不着好的工作,必须为他日后发展着想。

我说,我无权过问这些事情在你的心目中是否应该是件大事,毕竟每个人角度不同,看待事情轻重不一。 但无论如何,你因日思夜想着这事,你的世界从何时已变成了小如牛角,而你成日钻着钻着,无法解脱。若再不逃出来,就会久积成疾。最好的解决方式,就是先从牛角,即最坏的情况说起, 慢慢退出来。

先说A,女儿最坏情况就是考不上理想学校,这比一些连中学都考不上的学生好多了,可退一步;再说也比一些考上普通中学的同学好,因为他们4年后还要面对另一个考试,所以退三步。另外,早被学校录取胜过许多还没被录取的学生,这你就应该很开心。至于是不是理想学校,等日后女儿上了课再说吧。

再说S,现在考进本地大学多么不容易,考得进就很好了,这就退一步;另外,考取大学文凭只是踏入社会的第一步,不能笃定一个人日后的职业, 而现今从事与大学本科无相关职业的成功人士比比皆是,所以可以退五步。最后,职业只是人生的一部分,人生还有家庭和其他事务,最重要就是幸福快乐,以后若真的需要一张专业文凭,只要身体健康,机会还是有的。这就可以退出来了。

有些事情,我们怎么去想,都不会影响外边情况,重要的是我们如何去调整心态,控制我们的世界。我们的世界就跟我们脑袋那么大,你把它想得小,它就小得能够让你窒息;同样的,我们也可以把世界想得很大,大得让我们有空间去享受人生。

所以,朋友,不要再停留在牛角里,放大你的世界吧!

蓝璐璐
25.10.2011
==================================================
我想 …

有时候我们自己钻入了牛角都不知道,需要旁边的人提醒的。

不过, 有些人可能想太多,或是个性比较悲观/容易忧虑,要退出牛角也不容易,所以这个时候就要学习自我控制。

我们虽然做事情时应该以多方考虑利弊,但是没必要或改变不了什么的事情就不要去想,船到桥头自然直,有时候很多事情的发展都不是我们能够完全掌控的。兵来将挡,水来土淹也是这个意思。

这几天非常忙,下午讲课,星期五又要到台北做一个讲座,内容现在还在准备,看样子今天假日就这样子完了… Continua a leggere

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Cheap Xtend & Climb HEAVY DUTY Telescoping Ladder Type 1A – 300 lbs. Look At

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