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In mathematics, the nine lemma (or 3×3 lemma) is a statement about commutative diagrams and exact sequences valid in the category of groups and any abelian category.It states: if the diagram to the right is a commutative diagram and all columns as well as the two bottom rows are exact, then the top row is exact as well.
A similar tool of larger size is called an auger. The cutting action of the gimlet is slightly different from an auger and the initial hole it makes is smaller; the cutting edges pare away the wood, which is moved out by the spiral sides, falling out through the entry hole. This also pulls the gimlet further into the hole as it is turned.
When the letter X is preceded by a space, this means "by". For example, a chamfer may be called out as X [2] or ( ) number of places—for example, 8X or (8) When a dimension is used in multiple places either of these prefixes can be added to the dimension to define how many times this dimension is used. This example signifies eight places.
Any space between columns of text is a gutter.) The top and bottom margins of a page are also called "head" and "foot", respectively. The term "margin" can also be used to describe the edge of internal content, such as the right or left edge of a column of text. [3] Marks made in the margins are called marginalia.
If just 2 columns are being swapped within 1 table, then cut/paste editing (of those column entries) is typically faster than column-prefixing, sorting and de-prefixing. Another alternative is to copy the entire table from the displayed page, paste the text into a spreadsheet, move the columns as you will.
The N 2 chart or N 2 diagram (pronounced "en-two" or "en-squared") is a chart or diagram in the shape of a matrix, representing functional or physical interfaces between system elements. It is used to systematically identify, define, tabulate, design, and analyze functional and physical interfaces.
Most images should use [[File:Name|thumb|alt=Alt|Caption]] and not specify a size. The other details: are optional and; can be placed in any order, except for Caption that has to be the last parameter. Type thumb (or thumbnail; either can be followed by =filename), frame (or framed), or frameless. Displays the image with specific formatting ...
Also, the image can be specified as a thumb or frame, which means it has alt text and a caption in the usual way, with a double-rectangle icon instead of the blue "i" icon . To do this easily, you can use a Commons gadget, called ImageMapEdit, by Dario D. Müller (ImageMapEdit_Howto).