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In geometry, topology, and related branches of mathematics, a closed set is a set whose complement is an open set. In a topological space, a closed set can be defined as a set which contains all its limit points. In a complete metric space, a closed set is a set which is closed under the limit operation.
This should not be confused with a closed manifold.

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  1. kennedy1978mark

    Acs assesment knowledge

    hi , can anyone pls tell me what i need to know off the top of my head and what is acceptable to revert back to viper book ,in acs assesment .. assesment next week and i ve not stopped reading the viper book.. (took a week off work and been reading for weeks!!) but i just want to know if theres...
  2. C

    Confused!

    Just been to a job for noisy pipes. Found the fault on the torbeck valve and then customer asks me to turn on the hot tap for the bath, water comes out ok but also comes out the CLOSED h/w tap in the wash hand basin (neither a trickle or full rate) Can't understand how water comes out of a...
  3. K

    Very noisy integrated dishwasher

    I have inherited a Neff integrated dishwasher which is really noisy when drawing water. It makes a loud bang when the valve to let water in is opened and closed. I'm not aware that we have overtly high water pressure, so is this normal? Is there anything we can do to stop it making this noise...
  4. P

    Pump running 24/7, and bypass gate valve appears closed & leaks when opened...

    Hi there I'd really appreciate any advice regarding this problem, before I call an engineer out. We moved into a new house last year. CH and HW all seemed to work fine. However the pump is on 24/7 - even when the room thermostat and programmer are all off. Initially the problem was...
    • perfectplanet
    • Thread
    • appears boiler bypass closed gate valve leaks opened problem pump running valve which
    • Replies: 4
    • Forum: Plumbing Jobs | The Job-board
  5. T

    Acs!!

    What exactly does the acs involve? I know it involves portfolio work but as regards to exams what has to be done? Written ?
  6. M

    Pressure problems on closed heating system

    I have an old radiant boiler which when running would get up to 3 bar. This would activate the pressure release out the back of the house resulting in too low pressure when cold. I have had problems with the pressure vessel before so I though it might need pressurising again so I: Drained...
  7. R

    Shower cold water feed

    Hi, My shower is awful at the moment because the cold water comes from the water tank in the loft which is probably 1 degree in temp or even ice and the thermostatic valve is completely restricting the flow becuase of the very cold water.. A friend of mine mentioned closed systems and the fact...
  8. M

    closed moulded pans argghhh

    these are annoying me more and more - servicing them, and fitting the buggers!!!!!!! any tips ??? at the moment im using the adjustable pan connector and flexi from the cold feed to the cistern, then pushing it back - just seems hit and miss with pan connector - sometimes leaks.
    • moony
    • Thread
    • back to wall cistern closed cold connector fitting flush hose job merchant pan pipe rubber saniflo seal soil soil pipe supply valve wall water website work
    • Replies: 15
    • Forum: Plumbing Jobs | The Job-board
  9. A

    oil boiler's closed heating system

    Hi all Was called to a job this morning to sort a problem out with a shower. This was done, no problems. Customer said that there was a problem with the heating upstairs (they had taken a radiator off the wall to decorate). Having looked at the boiler manual, i discovered it was a closed...
    • andyb
    • Thread
    • boiler central heating system closed cylinder expansion expansion vessel filling loop fix gas gas boiler heating system hot hot water inside job manual oil pressure problem radiator shower system vessel wall water worcester
    • Replies: 7
    • Forum: Plumbing Jobs | The Job-board
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