The word "tt" is not correct or usable in written English
It is not a valid word in any form of the English language.
Otherwise, Estonian orthography marks the three degrees of duration only for stops: b, d, g indicate single short (voiceless lenis) stops (tuba 'room'); p, t, k are plain geminates, or double consonants (tupe 'of the sheath'); and pp, tt, kk mark extra-long geminates (tuppa 'into the room,' tuppe 'into the sheath').
Korean distinguishes two other kinds of obstruents (stops, or fricatives): heavily aspirated p', t', k', and ch' and reinforced (tense) pp, tt, kk, and tch.
If T x, t) denotes the temperature at position x and time t, then it satisfies a partial differential equationTt = a2Txx (15)that differs from the wave equation only in having the first time derivative Tt instead of the second, Ttt.
A stop for which there is no English letter is the glottal stop, which occurs in the Scottish, Cockney, and Brooklynese pronunciation of the tt in "bottle" ("bo'l"); in other tongues (e.g., Arabic) the glottal stop has a separate mark in the script.
The Koine replaced the Attic tt with the ss characteristic of Ionic and other dialects (e.g., glōssa for glōtta 'tongue') at an early date, but its main phonological characteristic is the gradual simplification of the rich vowel system of Classical Greek.
Line 2, maken/machen, is generally chosen as the boundary between Low German and High German, because it is typical for the shift of p, t, and k after vowels to ff, ss, and ch, respectively (hopen/hoffen, bīten/beissen, maken/machen), and of t and tt to z and tz, respectively (ten/zehn, sitten/sitzen).
Results of the High German consonant shift p- pound Pfund pp apple Apfel Vp** hope hoffen t- ten zehn tt sitting sitzen Vr ** bite beissen k- can khann* kk lick lekchen* Vk ** make machen *Khann and lekchen, with affricates, are southern dialect forms; Standard German has stops: kann, lecken.
James's interest in the inner lives of others, and in writers like Tolstoy who share his understanding of their "mysterious ebbs and flows" (TT 255), leads him to the prolonged study of human religious experience that he presented as the Gifford Lectures in 1901 2, published as The Varieties of Religious Experience in 1902.
In order to indicate that we are dealing with a discrete family rather than a continuous one we sometimes replace 'Tt' with 'Tn'; this is just a notational convention of no conceptual importance.[4] In such systems the progression from one instant of time to the next is also referred to as a 'step'.
Hence, from a mathematical point of view the time evolution of a system consists in a mapping of X onto itself, which is why the above definition takes Tt to be a family of mappings of X onto itself.
So far we have described Tt as giving the time evolution of a system.
