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## Main Question or Discussion Point

I don't know why, but I have a slight ambiguity regrding the Rydberg formula.

In some places it is written as :

1/λ= R

In some:

E= -R

In some:

1/λ= R

At some:

1/λ= R

Please tell me. Where these formula are used? Are they even correct?

In some places it is written as :

1/λ= R

_{h}(1/n_{1}^{2}-1/n_{2}^{2})In some:

E= -R

_{h}(1/n^{2})In some:

1/λ= R

_{h}*(z^{2}/n^{2})At some:

1/λ= R

_{h}*(z^{2})(1/n_{1}^{2}-1/n_{2})^{2}Please tell me. Where these formula are used? Are they even correct?