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I'm fairly certain the と particle here is the conditional form. But I could be
totally wrong.

それが真実であると仮定しよう。

The translation I have for it is, "Let's suppose it is true". But it seems odd
to me that と is being used conditionally. Wouldn't it transliterate to
something like, "If it is true, let's suppose"?
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2020-08-03T02:11:23.507
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2020-08-03T12:18:05.153
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question
grammar particle-と
Can someone help me understand what the と particle is doing in this sentence?
This と is a _quotative_ -と, not conditional.

> それが真実であると仮定しよう。  
>  Let's assume that it is true.

A conditional-と cannot be used with (し)よう in the first place. Something like
雨が降ると家にいよう is already ungrammatical.
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2020-08-03T02:34:08.237
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2020-08-03T02:34:08.237
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The と used here is not conditional form. The usage here is defined as follows:

⑥（発話・思考を表す動詞とともに使って） **発話・思考の内容を示す** 。（明鏡国語辞典） と is used to indicate the
content of one's thought or speech when used with a verb like think,
speak,etc.

それが真実であると仮定しよう。Here, と means 「それが真実である」is the content of 「仮定する」. Namely, Let's
assume that [that is true].
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2020-08-03T12:18:05.153
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2020-08-03T12:18:05.153
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answer