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Epistemology - m a t h 4 w i s d o m - g m a i l
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Introduction E9F5FC Questions FFFFC0 Software |
Zig Zag Lemma Notes Looking forwards and looking backwards we get two ways of defining an element and typically we take the difference (such as {$b - i(a')$} )and show that the difference has boundary zero. And the difference has the properties we want because one of the ways will go away, for example, moving forward. No holes means being able to invert the image. |

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