Recent content by supasupa

Why Zinc is so commonly use coat metals such as steel? I know that its a good corrosion resistant metal to use but what properties of zinc make it good to use under normal atmospheric conditions? Does it have to do with the oxide layer that it forms around it?

thats what i have been trying to use. The set size is m and you are choosing from n. Is it correct in saying P(m,n)

yeah order does matter as it maps a different function... but i just can't undersatnd how to work out all the possible funtions there can be

that makes sense... what you are saying is the oxide around the steel (rust) slows down the corossion rate

i am kinda confused now... you are right when u say that f(2) is not the same function. So how do you take in all possibilities... I can't really see a pattern where i can come up with a formula in terms of n and m

m^n doesn't work as you can't map to the same value at T, as then it won't be one-to-one...

no order doesn't matter, only thing is once you map to set T, you can't map to the same element again to satisfy the 1-to-1 requirement

There are 2 parts to this question: How many functions are there from a set S with n elements to a set T with m elements? Assume n<=m, how many one-to-one functions are there from S to T? I am pretty sure that the answer to the first part is mn. So if there are 3 elements in the first...

I am pondering over how the rate of corrosion in metals are effected. Does E(V) of the reactions play an important part in this?

thats ment to say : "Say if a piece of steel..." NOT " Say is a piece..."

From my experience with pointers, it creates a lot of problems when you don't know how to handle them properly... ie. dangling pointers and so on. And passing by reference in JAVA works a lot better for me and is easier to understand...each to their own i suppose...

Say is a piece of steel is placed in still water and is corroding. Why will the corrosion rate drop away after time?? Is it because the system reaches some sort of equlibrium??

i see what you mean...thank you for that...the form is easier to follow and conclude...

The question is If A U B is a subset of A intersect B, then prove that A=B Now i can see this in my head and it makes sense that the elements in set A and Set B would have to be the same. The problem that i have with subset questions is how to prove that this is the case. I can start by...

Note: using * for (NOT) using @ for AND Given that (P v Q ) -> R , R <-> S , *S are all TRUE. Show that *P is true. R <-> S is the same as (R->S) @ (S->R) for this to be true, S if false and hence R is False If R is false, therefore (P V Q) is False for (P v Q ) -> R to be true...