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> 結果はホームページ **において** 発表されます。
>
> 結果はホームページ **で** 発表されます。

Both of these sentences seem to translate into "As for the result, homepage on
will be posted," or more naturally, "The result will be posted on the
homepage." What does において actually add to the sentence compared to when で is
used?

Another example is shown below.

> ロンドン **における** 国際会議が行われた。

This sentence translates into "The international conference took place in
London." Can't the sentence be written just as well as "ロンドン **で** 国際会議が行われた"?
Again, what does おける add to the sentence?

(Example sentences taken from this
[link](http://japanesetest4you.com/flashcard/learn-
jlpt-n3-grammar-%E3%81%AB%E3%81%8A%E3%81%84%E3%81%A6%E3%81%AB%E3%81%8A%E3%81%91%E3%82%8B-ni-
oiteni-okeru/).)
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question
grammar words
Why are において・における necessary?
I think that using おける give a bit stiff, formal and literary impression. So it
is often used in speeches and articles.

I think ロンドンにおける国際会議が行われた is unnatural, and ロンドンにおいて国際会議が行われた or
ロンドンで国際会議が行われた would be natural.
CC BY-SA 3.0
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answer
To add to Yuuichi Tam's answer, において・における are taking on the role that で would
normally fill in these sentences, not に. The particle で is used when you are
marking the location where an action takes place. However, において・における are more
flexible than で, in that they can also be used for "non-physical" locations,
like "in Japanese politics" or "in anime." So it is a flexible, formal way to
play the role of marking the location of an action. It's common to see it on
Wikipedia.
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answer