everything i have to prove seems impossible(adsbygoogle = window.adsbygoogle || []).push({});

then i see it done and it seems so easy

any help on starting a proof,...anybody ever have this problem

i am new to this stuff, but my problem is I don't know what i need to show and what is legal to use

so this is my current problem, i'm sure it's extremely easy for all you math geniuses so spare me the arrogance

If f itself is 1-to-1 then f^-1 is a function.

Let f:G->H be an onto function

prove

(i) If V is contained in H then f(f^-1(V))=V

i'm pretty sure i understand onto and 1-1 definition

i also understand why it's true, i think

i also can somewhat understand the homomorphism stuff of it

i just don't know where to start, what to do, what it really is asking

then i gotta prove this, but have not looked into it because i'm still on (i)

(ii) If W is contained in G then W is contained in f^-1(f(W)) and this could be a strict containment

abstract algebra seems to be an endless barrier in my math knowledge

is the key to it, memorizing endless amounts of definitions??:yuck:

seriously

**Physics Forums - The Fusion of Science and Community**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# I can't start proofs

Loading...

Similar Threads - can't start proofs | Date |
---|---|

Can't understand this statement about factor rings | Mar 20, 2013 |

I understand how to use determinants but I can't make a mental representation of them | Jul 17, 2012 |

Can't understand technique for computing transformation matrix | Mar 9, 2012 |

Linear Algebra: Can't make sense of it! | Oct 25, 2011 |

**Physics Forums - The Fusion of Science and Community**