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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.
View More On Wikipedia.org
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.
View More On Wikipedia.org
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grout residue on Black porcelain tiles
Hi Gents, In need of much advice as possible. I've recently just finished tiling 4 walls and a floor using 600mmx300mm black unpolished porcelain tiles. Grouted with Bal Microban which dries very slowly and Im finding it difficult to completely clean off all residue. The tiles are slightly... -
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Grout residue
Hi. I need some advice on what I can use to clean the grout off newly fitted tiles. They are Porcelain and have a really rough finish to them. The grout has dried into them and I need some type of chemical to clean them. I have tied quite a few things and although I will eventually get them...- deuce22
- Thread
- aus grout residue tile grout usa
- Replies: 8
- Forum: Canada
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Self levelling over thin bitumen residue
Hi. My floor at home is part screed and part marley tiles. I need to level the floor, so was thinking take the marleys up and cover the bitumen residue ( not even a mil thick) with Arditex NA. Then any more levelling that needs to be done, I can use my normal Ultra leveller on top. Is this...- tomo13
- Thread
- aus bitumen compound levelling mixing over residue self self levelling usa
- Replies: 11
- Forum: Canada
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lithofin cement away vrs KF cement residue remover
Iam wondering if anyone has used lithofin cement away on porcelain tiles indoors? I only ask as Iam in need of a strong cleaner for removing grey grout haze from black porcelain tile(not polished). It was recommended for me to buy KF cement residue remover but I cant find it locally but one... -
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Removing sticky sealant residue
HI guys. Sorry, I know it's a bit of an old chestnut, but wanted opinions on the best remover. My brother helped me out by chipping out all the grout from the vertical corner joints between walls in my bathroom, and then pumping BAL Micromax silicone in. Made a right pigs ear of it as he didn't...- Merlin5
- Thread
- aus removing residue sealant usa
- Replies: 10
- Forum: Canada
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Sticky residue on floor tiles
Hello, A friend has had a marble tiled and sealed floor cleaned by mistake with flash, a while ago, by the wife none the less. This has left a sticky residue that even after cleaning with water and a mop over a few months doesn't seem to go away. I'd be grateful for any help on how to...- MarbleTiles
- Thread
- aus floor floor tiles floor tiling residue tile tiles usa
- Replies: 2
- Forum: Canada
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Salt residue
Hi guys My plasterer has a query that I hope you guys can help answer. There is a salt residue appearing on a fireplace wall. The wall itself is bone dry though it looks like limestone. The salt itself appears certain times of the year & can be wiped off. The wall itself needs stripped back...- Bubblecraft
- Thread
- aus residue usa
- Replies: 6
- Forum: Canada
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Grout sealing and cleaning silicon residue from tiles
Two quick questions. I've got a bottle of Fila grout protector from Topps Tiles and am going to seal the grout between the ceramic splashback tiles on my kitchen wall, between the porcelain tiles on the kitchen floor, between the ceramic tiles on my bathroom walls (different ceramic tiles from...- Merlin5
- Thread
- aus cleaning coverage grout liquid paint residue seal sealing silicon tile tile grout tiles usa
- Replies: 4
- Forum: Canada
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LTP colour intensifier residue removal.
Have recently been asked to clean up a terracotta floor that has had LTP colour intensifier over applied and now there is a horrible grey shiny bloom on alot of the tiles. I've used 8 to 1 mix of LTP power stripper which didn't remove the bloom and then a stronger mix of 1 to 4. But that still...- chuckles
- Thread
- aus colour removal residue usa
- Replies: 5
- Forum: Canada
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epoxy residue on galaxy tiles
went to see a job today. galaxy tiles (with sparkling bits) 600x300 grouted with grey KERAPOXY and silver glitter. Tiler made a bad job with washing off a grout and left runs on tiles. Customer has tried LTP stuff to remove runs but still can be seen as sun is hitting the walls. And down lights... -
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Rendered wall residue
Hi I am tiling over a rendered wall which was previously tiled using the Ready mixed adhesive. I have removed all the old adhesive to give a smooth finish but it has left some residue in between the grains of sand/cement. As its powdery I was intending to prime this with Mapei primer G diluted...- besenzig
- Thread
- aus residue usa wall
- Replies: 5
- Forum: Canada
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Help Please. Grout residue on brazilian slate floor !!!
Hi everyone, I have just laid a 65 metre floor for a customer on anhydrate screed. i sealed the slate first with stain stop and grouted with bal flexigrout grey. Although i thought i had cleaned off all grout residue there is still a very small amount on the face in places. Although it is a...- qualitywork
- Thread
- aus floor floor tiling grout help please residue slate tile grout usa
- Replies: 7
- Forum: Canada
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Grout Residue Removal on Travertine Mosaics
Hello, I'm a tiler from Reading. most of my work is kitchen related. One other person who sometimes feeds me work is a building contractor. Before he met me he had some cowboy tile his wifes 'big dream' ensuite (he didn't know he was a cowboy at the time of course). That was a few years ago. The...- wayfoward
- Thread
- aus grout mosaic mosaic tiling mosaics removal residue tile grout travertine usa
- Replies: 9
- Forum: Canada
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cleaning a residue left on tiles after grouting
Hi all, Done a little bit of tiling a few days ago all went well but after grouting and clearing the grout off the tiles I noticed the Finnish of the venis monker tiles looked damaged almost scraped looking no shine on the glaze tried a few household cleaners hoping it was just a residue on...- Lee786
- Thread
- aus cleaning grout grouting residue tile tile grout tiles usa
- Replies: 12
- Forum: Canada
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removing masking tape residue
anyone got any ideas how to remove masking tape residue from an acrylic bath, some one told me WD40 but dont know how true that is, also anyone recommend any other tape other than masking tape, anyone used frog tape ?- ian158
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- removing residue tape usa
- Replies: 15
- Forum: America
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water drip marks on ceramics? also silicone residue
guys, I have some dried on soapy water drip marks that ive seen in low light on my ceramic tiles.. (from spraying soapy water on silcone ) These are proper hard work to rub out/off.. is there a specific product I can use to assist me? or a house hold liquid.. such as vinegar??? (will stink so...- davemul
- Thread
- ceramic ceramic tile ceramics marks residue silicone usa water
- Replies: 7
- Forum: America
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Matt tiles - how do I get the white residue off after grouting - stressed...
As it says lads.... Im stressed, I keep cleaning them and it keeps coming back, Is there a product one can buy from the tiles shops.... please say yes,.....- John the tile
- Thread
- grout grouting how matt off residue tile tile grout tiles usa white
- Replies: 10
- Forum: America
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Limestone Patio - removal of grout/cement residue?
Hi there, We recently had a black limestone patio laid and unfortunately there is a fair amount of residue left on it from the excess grout and cement. Sadly I tried an acidic cleaner on a tile (fortunately not in main view) which obviously corroded the tile and left it grey-ish. My husband...- JuliaB
- Thread
- cement grout limestone patio removal residue tile grout usa
- Replies: 12
- Forum: America
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Help Please - Grout residue!
I need to clear some grout residue on my tiles and have bought the mix from BandQ which I think has helped (though it has dyed my charcoal grout to a whiteish colour...!) but there is still chunks there. Is there a better remover available, and also, what sort of brush/cloth should I use? I've...- fazza
- Thread
- grout help please residue tile grout usa
- Replies: 13
- Forum: America
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Grout residue problems
Hi I am tiling some ceramic tiles in my bathroom which is going well. However now that I am grouting I tried doing too big an area which meant that some of the grout has dried onto the tiles in small patches. I am having trouble removing this excess grout and have resulted in scraping...- Paul Cockhill
- Thread
- grout problems residue tile grout usa
- Replies: 1
- Forum: America
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