The phrase "and it is invariable" is correct and usable in written English.
You can use it to indicate that something remains constant or unchanged in a particular context.
Example: "The formula for calculating the area of a circle is always the same, and it is invariable regardless of the size of the circle."
Alternatives: "and it remains constant" or "and it does not change."
Like the experimental models, we have found that there is a watershed level of GFR above which ESRF is unlikely and below which it is invariable, and that the most important harbinger of poor outcome is proteinuria.
The real, the experienced and the concrete are recognised by the fact that they are variability itself, the element by the fact that it is invariable.
The non-coding region between np 5160 and np 5191 was not considered, but we checked that it was invariable.
If bit 1 is transmitted, then after E1 and H1, the output value will be zero since P11 is invariable after E1, and it is suppressed after H1 due to the property.
This is in contrast to a cryo-probe, where the transmission line impedance between coil and preamplifier is invariable.
The growth of spherulites was observed during solidification, and it was concluded that the images were invariable after times of 20, 30, 60, and 100 min; therefore, after these times, the samples were cooled to room temperature.
The crowds are enthusiastic, and the message is invariable: If you breathe, here's your man.
And the element is invariable by definition, being a diagram, a simplified reconstruction, often a mere symbol, in any case a motionless view of the moving reality.
Nasal symptoms and respiratory distress usually start soon after birth, and by adulthood bronchiectasis is invariable.
It was the right-hand rhythm of Dominguan-descended Louis Moreau Gottschalk's "Bamboula" in 1848; it's the invariable underlying rhythm of reggaetón; and it's the rhythm underpinning the Guadeloupean demonstrators.
