isnt the total resistance of the triangle that 80 ohms? so resistance of one winding should then be 80/3? well apparently not because i dont get the right answer with that
Homework Statement
Three-phase transformer, 20/0.5 kV, dyn11. Not connected to the grid.
DC-resistance between two primary windings is measured to be 80 ohm. What is the DC-resistance of ONE primary coil
Homework Equations
The Attempt at a Solution
I thought I could just...
Homework Statement
Are the given functions injective? Surjective?
a) seq: N -> Lists[N]
b) f: Lists[A] -> P(A), f(x)=(<x1,x2,...,xn>)={x1,x2,...,xn}
Homework Equations
The Attempt at a Solution
a) Ok so the domain contains a sequence of natural numbers.
and the range contains a list...
Homework Statement
I'm supposed to prove that this statement is a tautology (with truth table):
(p -> ((p OR q) AND ~q)) = (~p OR ~q) AND p
Homework Equations
The Attempt at a Solution
p | q | ~p | ~q | p OR q | (p OR q) AND ~q | p -> ((p OR q) AND ~q) | (~p OR ~q) | (~p OR...
Ok I dont understand one thing...We ahd this example in school
We have poset < {1,2,5,7,10,14,35,70}, | >
| meas factor, for example a|b means b=ka, where k=integer
and we got this Hasse diagram
70
/ | \
10 14 35
| X X |
2 5 7
\ | /
1
X means...
[0] must then be only {0}
What about R: R <-> R, where xRy, iff floor(x) = floor(y)
i dont know if floor() is the right way to write floor function, but cant find the correct symbol. [2] is then something like {2, 2.1, 2.2, ... , 2.99999...} but what is the correct way to write it? Because 2...
I thought I understood the b) part, but now im not sure if i do deeply enough.
So, in each class the elements are "equivalent" in the way the equivalence relation is defined? xmod4 = ymod4 means every element which has same modulus when divided by 4 belong to same class?
can [-3] then be only...
hmmm...y must always be +x or -x?
but i dont understand how the classes are formed. For example class [0], does it mean the list starts at 0? In the b-part the list increases always by 4, but what about in this, by 1?
Homework Statement
Find the equivalence class [2] for the following equivalence relations:
a) R: Z <-> Z, where xRy, iff |x| = |y|
b) T: N <-> N, where xTy, iff xmod4 = ymod4
N means natural numbers etc...there wasnt the correct symbols in the latex reference
Homework Equations
??
The...