math。在英式口语中mathematics可写作maths，在美式口语中mathematics可写作math。mathematics或maths，其英文来自希腊语，“máthēma”；经常被缩写为“math”。mathematics单复数同形，但指作为一个科学分支“数学”或作为一个学科的“数学”时，句中谓语动词要用单数形式；如果是用来指这门学科中的具体内容或数学实践能力时，如“数学能力”“数学成绩”“数学应用”“计算能力”“运算结果”等，则动词要用复数形式。例句：Those math problems made me 那些数学题弄得我晕头转向。
math。在英式口语中mathematics可写作maths，在美式口语中mathematics可写作math。mathematics或maths，其英文来自希腊语，“máthēma”；经常被缩写为“math”。mathematics单复数同形，但指作为一个科学分支“数学”或作为一个学科的“数学”时，句中谓语动词要用单数形式；如果是用来指这门学科中的具体内容或数学实践能力时，如“数学能力”“数学成绩”“数学应用”“计算能力”“运算结果”等，则动词要用复数形式。例句：Those math problems made me 那些数学题弄得我晕头转向。扩展资料：数学是研究数量、结构、变化、空间以及信息等概念的一门学科，从某种角度看属于形式科学的一种。数学家和哲学家对数学的确切范围和定义有一系列的看法。数学家的故事及重要定理：数学中最重要的—数的定义。公元前400多年，数学家毕达哥拉斯提出了勾股定理（a*a+b*b=c*c），从而出现了毕达哥拉斯学派，这个学派认为所有数都可以用精确的数字来表示。而学者希帕索思却认为世界上有无限的不能循环的小数，但却因坚持己见惨遭杀害。后来，人们发现，其实数分两个类型，一个是有理数，另一个就是无限循环的无理数。这也同时证实了鲁迅先生的一句话：“悲剧就是将人生极有价值的东西毁灭给人看。”参考资料来源：百度百科-数学 （学科）
The password of which can not be decipheredPassword can be said play very large role in today's social life ， besides the well-known aspects of military and defense applications， the modern financial， trade and production are all in large-scale use of Extensive application of computer networks， causing people to rely on passwords to a new height， in the tens of millions of computers connected into the Internet， the user's identification is basically relying on Your password has been cracked it will endanger the safety of produce very serious Computer "hacker" as， that is， an example of code-breaking， even the US Defense Department computers are not spared， showing the difficulty of � by a large integer factorization problems， it successfully developed a kind of "can not be deciphered，" password: RSA system password (see Articles 2000， N 6， "big integer factorization problem" an enclosure) RSA public key password is a password， it "can not be deciphered，" is used to describe the difficulty of decoding， but did not find so far is still a theoretical tool to � general cryptography theory， called to pass the original text as "clear"， after the actual transmission is encrypted passwords constitute a "ciphertext"， the destination will decrypt it and restore it as a clear understandable， to complete the the communication Encryption and decryption of which the two sides agreed to use communication methods， this method is called the More generally， it is first given an encryption algorithm， is not， strictly speaking， this algorithm can be put as a function of the value of the function is the key， and the decryption algorithm can be described as an inverse function of encryption algorithm， using the same one key (the original function value) can be uniquely translated into plaintext � password key is communicating parties agree the key without being known to the outside， the outside world also points to crack the password And in order to prevent possible to decipher the outside world， they should strive to make an outsider can not be accumulated in the same number of ciphertext under the key， otherwise， statistical analysis can be identified such as keys， world war history， diplomatic history has many examples of successful This constantly changing keys， it is important communications should be changed every day or even pass a letter to change � How can such a frequent change of keys to give them? If you with additional information (with radio or network) easily compromised， every time they send someone to send is not possible， how to solve this problem? This is the password of the strengths of RSA， and it put the key into the key encryption keys If A and B Communications， A public service of the encryption keys B (available plain language or with the last communication cable at the same time)， not afraid of outsiders to know， so they are called public key， while the key solution to stay in their office does not reach B， B closed to a public key， use it to encrypt the information to give A， and then back to A (this is no special secret)， then A can be in the hands of the decryption key to � an outsider without the decryption key， it no cracked password， then add the key there will be no reconciliation between the key it? Of course not， otherwise it can not be However， this relationship is based on large integer factorization on the basis of In other words， the public key is derived from the solution of the key to conduct a sufficiently large integer factorization， you can not break down no way to
