Pure math

intergration

1   a. Prove that a+b=b+a for any real nember a and b
     b. Prove that 1+2=3
         Hence,prove that 2+1=3

2   a. Prove that ab=ba for any real nember a and b
     b  Prove that (1)(2)=2
         Hence,prove that (2)(1)=2


　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　     HKALE Pure math 2013

just joking..

p445hkk20001

好高深…
簡直唔係pure  應該係大學以上既數

-終場ソ使者-

施主,相信2013年的pure要在大學才再到

數學小子

聽講1+1=2係要用1d高深既logic用set theory去prove

[H]bunbunbunbun

Honestly there's not much to prove

Axioms of real numbers states that addition and multiplication are commutative
so a+b=b+a and ab=ba for all a,b real

also 1 is the identity of multiplication so by the axiom 1(2)=(2)(1)=2

prove 1+2=3 depends how much you can assume on the real number system
hell this is more like a philosophical question than an analysis question -,-