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Reuben Hersh有感于Courant的《数学是什么》(What is Mathematics?)只是“秀”了数学却没有正面回答问题,就写了一本What is Mathematics, Really?(Oxford版,1997)从“人文主义”(humanism)——区别于传统的各种数学主义,如Platonism, logicism, intuitionism, constructivism, conventionalism, structuralism, fictionalism等角度考察数学——数学是一种“社会-文化-历史活动”(A humanist sees mathematics as a social-cultural-historic activity),“数学是一种生命形式”(a form of life)。他列了数学哲学12条:
1. Breadth
2. Connected with epistemology and philosophy of science
3. Valid against practice: research, applications, teaching, history, computing, intuition
4. Elegance
5. Economy
6. Comprehensibility
7. Precision
8. Simplicity
9. Consistency
10. Originality/novelty
11. Certitude/indubitability
12. Acceptability
陶哲轩(Terence Tao)也列过很多条“好数学”的标准,除去一些“普通条款”(如解决重大难题,发展新技术,系统化,重要应用,大众普及等等),还有几条特别的,如好的愿景(vision),好的品味(taste),好的元数学(或数学基础),
Good mathematical vision (e.g. a long-range and fruitful program or set of conjectures)
Good mathematical taste (e.g. a research goal which is inherently interesting and impacts important topics, themes, or questions)
Good meta-mathematics (e.g. advances in the foundations, philosophy, history, or practice of mathematics)
Beautiful mathematics (e.g. the amazing identities of Ramanujan; results which are easy (and pretty) to state but not to prove)
Elegant mathematics (e.g. Paul Erd˝os’ concept of “proofs from the Book”; achieving a difficult result with a minimum of effort)
Intuitive mathematics (e.g. an argument which is natural and easily visualisable)
我想任何科学都应该学习这些优良品质。如果一门科学还只是一味讲“解决问题”而没想到“好”和“美”,那就只是“猿文的科学”而不是“人文的科学”。
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