Solution of/to/for equation

A recent question to when to use of and when for/to for solution suggested that of appears only in context of chemistry, and the word means something very different then. But I recalled almost universally finding

−2 and 2 are the solutions of the equation x² = 4.

I consulted the dictionary and to my surprise I found:

2. Mathematics A value or values which, when substituted for a variable in an equation, make the equation true. For example, the solutions to the equation x² = 4 are 2 and −2.

I consulted the ngram and it made me even more confused than before.

ngram

It seems like solution to the equation is a relatively new trend, but picking up.

So, what’s the official stance on correctness of the preposition to go with solution in mathematics?

Answer

Prepositions are versatile words with overlapping meanings. There are several usages in English where more than one preposition could be used, with little or no change in meaning. Let me reiterate that: there are several usages in English where more than one preposition could be used, with little or no change of meaning.

The Ngram is interesting, but hardly surprising. There’s no “official” correct preposition here.

Attribution
Source : Link , Question Author : SF. , Answer Author : Marco A.

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