Central Heating Unit Will Not Stay On?

If the burner is shutting off within a few seconds of coming on, the problem is most likely a safety control shutting down the system. There could be a number of reasons why this is happening. For example, a "spill" switch could be detecting the flame leaving the heat exchanger (or is faulty) or the cad cell (if you have an oil burner) could be failing to recognize that a flame is present and is stopping the burner to prevent filling the blast chamber with oil. If it heats properly when the burner actually stays on (cycles through the appropriate high/low limits and the fan comes on when the heat exchanger is warm), then I would not think there's a problem with limit controls. Look to the burner and safety controls.

1. What country has the best army in the world? Unit by Unit!?

America! No one else even comes close

2. Unit Test - an Enigma? [duplicate]

What is unit test anyway?A unit test is a piece of code that takes one unit (usually a method or free function, sometimes an entire class or module), isolates it from the rest of the application, runs it against a known environment, and verifies that it behaves as expected. A typical pattern is "set up, define inputs, run, assert outputs, tear down", where the "set up" and "tear down" steps create the known environment. For any unit that depends on other units, a technique called "mocking" is used, that is, the tested unit is put in a context where the dependencies are not the real thing, but rather placeholders / stubs. For example, if you test a method that runs against a database class, you do not use the real database class, but a mockup class that ignores its input and returns a hard-coded data set containing what the real one should return.Ai not I testing a specific part of code while running the whole app itself?You are, but not in isolation - you are testing the entire application, and when something fails, you often know that it fails, but not where and why. Unit tests tell you that each individual part of your machinery works as specified; testing the whole thing, or larger parts of it, in concert (a. k. a. "Integration testing", "End-to-end testing", or "Simulation testing") is just as important at unit testing, but it serves a slightly different purpose and has a slightly different focus.What is its use?Unit testing has several uses:I have read few articles, wikipedia etc. but I am not sure whether unit testing is a time consuming or a time saving process. The jury is still out on this one, and rigid research in this area is hard if not impossible (how do you do double-blind studies about programming methodologies?) However, there seems to be quite some consensus that automated tests are an investment worth making for almost all projects; a single debugging session can easily eat up ten times the budget spent on writing unit tests, and an unnoticed design flaw can be many times more expensive even. Consider the alternatives:

3. Is $-1$ a unit in every ring?

$-1$ is certainly a unit, because $(-1)(-1)=1$.A ring homomorphism $varphicolon R_1to R_2$ send units to units: if $u$ is a unit in $R_1$, with inverse $v$, then $$ 1=varphi(1)=varphi(uv)=varphi(u)varphi(v) 1=varphi(1)=varphi(vu)=varphi(v)varphi(u) $$ proving that $varphi(u)$ is a unit in $R_2$. The induced map between the groups of units is obviously a group homomorphism, because $varphi$ preserves products.Note. If ring homomorphism are not supposed to preserve the identity, the result is generally false.

4. Issue with displaying unit vectors

In proper method, which you can also see in the log. Try this (memoir class not related, just happens to be the basic class in my editor):EDIT: If you want them upright, then with the packages I used, you code should work. If not, then as usual on this site, please provide a full minimal example that we can compile and test. Sniplets like this usually does not help much

5. the basic metric unit of mass?

It's the killogram, which is the mass of a litre of water. I am not sure why it is not the gram, everything seems a factor of 10^3 off!

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