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residue
In number theory, an integer q is called a quadratic residue modulo n if it is congruent to a perfect square modulo n; i.e., if there exists an integer x such that:
x
2
≡
q
(
mod
n
)
.
{\displaystyle x^{2}\equiv q{\pmod {n}}.}
Otherwise, q is called a quadratic nonresidue modulo n.
Originally an abstract mathematical concept from the branch of number theory known as modular arithmetic, quadratic residues are now used in applications ranging from acoustical engineering to cryptography and the factoring of large numbers.
We noticed some black gunk/residue on the cold water mixer hose - see photos.
I was wondering what the root cause could be and whether we should replace just the cold water mixer hose or the entire mixer tap.
Maybe there is another solution - would be great to know.
Thank you very much.
Leonid
Thread
australia
hose
issue
likely
mixer
replacing
residue
solution
tap
Hi all, I did a LGSC today, on a 1-year-old Worcester combi.
Pics attached of the flow and return pipes to the boiler, coated with green powdery but dry residue. And also the pipe tray/cover, which had a sticky green residue. No other issues anywhere. But because it's just the central heating...
Hi all,
I have a plumbing mystery and I'd really appreciate some theories as to what's going on!
I've installed a new fridge and on removing the water supply for it noticed a lot of green/blue deposits coming through from the pipe that fed it.
This has come out of the cold water copper pipe...
Hello everyone,
I apologise if there was a thread regarding this topic. I am a first time renter and I have noticed weird residue on the pipes - could you please shed some light on the subject for me? Is it worrying? I have noticed that the pipes in that area we're wet a couple of month ago...
hi there, I’m wondering whether anyone has come across this problem before. Moved into my house a few years back and I noticed on nearly all surfaces where water comes into contact with there was a pink residue (e.g bathroom walls and grout, toilet pan, sinks) . Some areas worse than others...
Hi, We have a Worcester Greenstar 24i combi boiler which we think was installed in 2010. After taking a bath, we have noticed there are strange black specks/dots left in the bathtub which when rubbed smudge like mascara. The problem only seems to be in the bathtub and only when the hot water is...
one can dan
Thread
bath
black
boiler
could
problem
residue
strange
which
Hi, We have a Worcester Greenstar 24i combi boiler which we think was installed in 2010. After taking a bath, we have noticed there are strange black specks/dots left in the bathtub which when rubbed smudge like mascara. The problem only seems to be in the bathtub and basin in the bathroom and...
Just first fixing a kitchen,the existing dishwasher discharges into a gulley which enters the main drain,Custard wants it into existing gulley.Correct me but I thought dishwashers should discharge into main stack,due to food residue collecting into the trap in the gulley,has any one got the regs...
sheff paul
Thread
custard
dishwasher
gulley
residue
should
thought
waste
Was working on said boiler and I noticed on the inside there was a small puddle of thick brown residue, there was no visible leak from pump or anything else either, if never seen this before.
I should of took a picture, anyone ever came across this nah.. lol
mcniven
Thread
brown
ideal
ideal logic
inside
logic
residue
sticky
Hi
I dont know if this is the right place to post this question but here it is
I have been cleaning my coal effect gas fire today and i am a bit dissturbed because there is some blue and white residue on the base matrix .
What is it , is it normal and is it dangerous as i have never seen it...
Hello,
I've come across a horrible example of how not to seal around a kitchen sink - there's excess smears and then gaps in equal measure so it looks terrible as well as being ineffective.
So I'm looking for a product which will remove the old silicone and leave the surfaces in a suitable...
wheeto
Thread
kitchen
remove
removing
residue
seal
sealed
shape
silicone
sink
Greetings one and all!
Due to the downturn the en-suite is finally getting a re-vamp. As part of this a chrome towel radiator has been plumbed into a combi bloiler closed system. Just adding another towel radiator to the bathroom.
The instructions with the radiator have words to the...
wibble
Thread
about
bathroom
central
central heating
combi
diy
drain
flush
flux
heating
installation
question
radiator
radiators
refill
remove
residue
safe
sealed
smell
system
towel rail
water
Hi Guys,
I have just finished doing some major mods to an existing system which is mostly copper for the htg and a couple of lengths of Hep20 on the DHW F&R.
I have used mostly normal copper connections, led free solder, fernox flux, and some Tectite (discrete heat).
Need to flush the...
aviator99_uk
Thread
after
commissioning
connections
copper
dhw
drain
filter
flush
flushing
flux
free
power
remove
residue
sludge
system
work
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