The phrase "is valid only if" is grammatically correct and can be used in written English.
It is typically used to denote a condition or requirement that must be met for something to be considered valid. Here is an example sentence: This coupon is valid only if it is presented at the time of purchase.
By conditional consecutive CID/ETD validation, we mean that a peptide is valid only if the particular peptide was identified from the exact same precursor by both CID and ETD but regardless of the score.
However, this ratio between the concentration and peak current is valid only if the electrochemically active area of the working electrode is constant in each electrochemical test.
The age calculated is only as good as the existing knowledge of the decay rate and is valid only if this rate is constant over the time that elapsed.
A further grant, or agreement to make a further grant, of any right covered by a terminated grant is valid only if it is made after the effective date of the termination.
But that price is valid only if the costly flock of trumpeter swans — the song calls for seven swans a-swimming — are struck from the gift list, which is compiled every year by PNC Wealth Management in Pittsburgh as an amusing way to track the annual cost of living.
a search warrant is valid only if probable cause has been shown to the magistrate, and that an inadequate showing may not be rescued by post-search testimony on information known to the searching officers at the time of the search.
A Form W-8EXP is valid only if it contains the name, address, and chapter 4 status of the payee, the relevant certifications or documentation, and any other requirements indicated in the instructions to the form, and is signed under penalties of perjury by a person with authority to sign for the payee.
Subject to the provisions of clause (4) of this subsection, a further grant, or agreement to make a further grant, of any right covered by a terminated grant is valid only if it is signed by the same number and proportion of the owners, in whom the right has vested under clause (2) of this subsection, as are required to terminate the grant under clauses (1) and (2) of subsection (a).
Since for every, inequality (3.3) is valid only if.
This yield is valid only if the security is called prior to maturity.
Note that this equation is valid only if ∑ u = 1 K δ y ( u ) = 1.
