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expanded chain homotopy: added the usual non-commuting diagram, a discussion of chain homotopy equivalence and slightly expanded the description in terms of left homotopy
With reference to the italics in mathematics discussion, on my Browser (Firefox on a Mac) the ordinary downarrows are slanting left in that diagram. Is this the case on all browsers?
It’s the same for me, yes. Many of these commuting diagrams on the $n$Lab don’t look well on my browser (latest Firefox on Windows). All the arrows are tilted.
Oh, sorry. I guess Andrew just fixed this. Or something. It looks good now.
That looks much better. It must have been that italics problem that Andrew fixed.
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