What is Flat: Definition and 495 Discussions

A Flat is a Hindi thriller film, directed by Hemant Madhukar and produced by Anjum Rizvi.The film was released on 12 November 2010 under the Anjum Rizvi Film Company and Y.T Entertainment Ltd. banners.

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1. B What do people mean when they say “space is flat?”

Please excuse my ignorance I hear some people say that space is flat. What exactly do they mean by this?
2. Freon filled balloons go flat QUICKLY! Why?

Years ago, I filled some latex party balloons with Freon 12. I haven't repeated the experiment with the Freon 134 that is available nowadays. It was fun to throw them around because Freon is so much heavier than air--you can throw them across the room and they land on the floor and stay there...
3. B How can the Universe be flat? Ridiculous

The earth is a sphere. I can stand anywhere on its surface and look up directly above my head at the night sky and see lots of stars many light years away. I see this view wherever I stand on the earth's surface although the stars will be different ones, depending on where I'm standing...
4. POTW Flat Modules and Intersection

Let ##M## be a flat module over a commutative ring ##A##. Suppose ##X_1## and ##X_2## are submodules of an ##A##-module ##X##. Prove that ##(X_1 \cap X_2) \otimes_A M = (X_1 \otimes_A M) \cap (X_2 \otimes_A M)## as submodules of ##X\otimes_A M##.