'ts' is not a correct and usable word in written English.
You could use it informally as a slang abbreviation for the word "its" (short for it is or it has) in certain contexts. For example: "This painting is ts own original creation."
It comes down to hair and accent, really: the first is now less floppy, the second is missing about 50% of the Ts.
These were well-meant gestures of cultural aspiration from the 1960s – but today the effect is Orwellian, like a big picture of TS Eliot glowering down at you in Tower Hamlets.
By putting the cars they were making within their financial reach, the story goes, he sharply increased the market for his Model Ts.
Developed in the TS, it represents the last stage of the development of formal logic in Bolzano and at the same time the first modern study of axiomatic systems.
He was not happy with the TS because of Bolzano's concepts of proposition and intuition in itself and of his criticisms of Herbart.
It would later become the fundamental concept in Bolzano's treatment of axiomatic theories in the TS.
Any other newcomer to the mobile-phone market would have allowed, indeed encouraged, potential customers the Verizons, T-Mobiles, AT&Ts of the world to have at least some say in what went into its fledgling device.
In the latter case you can relativise the notion of model and write 'I ⊨ tS' to mean that I is a model of S at time t.
(where Uts represents the unitary evolution operator from time s to time t, and its adjoint U*ts the inverse evolution).
The Helmholtz free energy is defined as F ⇔ E − TS, where E is energy, T is temperature, and S is entropy.
