# Sper

## Definitions

• Webster's Revised Unabridged Dictionary
• v. t Sper To shut in; to support; to inclose; to fasten. "To sperre the gate."
• ***
Century Dictionary and Cyclopedia
• sper A variant of spar.
• ***
Chambers's Twentieth Century Dictionary
• v.t Sper spėr (Spens.) to bolt, to shut, as a gate.
• ***

## Etymology

Webster's Revised Unabridged Dictionary
See Spar bar

## Usage

### In literature:

Tithings to sper he howid yaim amang.
"Chronicles of Strathearn" by Various
I've had 'sper'ence 'ith sich, 'n' onct in a lifetime 's 'nough, heav'n knows!
"A Maid of the Kentucky Hills" by Edwin Carlile Litsey
***

### In news:

Jeff Sperring, the chief medical officer of Riley Hospital for Children at Indiana University Health, has been named the hospital's new president and CEO, the hospital announced Friday.
Before he left on his camping trip, Sperring advised his girlfriend and parents where he was going and when he would be back.
For more than 25 years, Sper Scientific has manufactured and distributed precision measurement instruments, including meters for testing a variety a water quality parameters.
***

### In science:

We consider v = W (−t)J s x u for u ∈ Sper .
On the Cauchy problem for the derivative nonlinear Schroedinger equation with periodic boundary condition
To prove (15) it sufﬁces to prove an estimate for the sup norm for u ∈ Sper by density.
On the Cauchy problem for the derivative nonlinear Schroedinger equation with periodic boundary condition
We denote by SFix(f n) the ﬁxed points of f n which are saddle points, and by SPer(f ) = Sn≥1 SFix(f n ) the set of all saddle points.
Equality of pressures for diffeomorphisms preserving hyperbolic measures
We introduce a ﬁltration of subsets of SPer(f ) which are ordered according to the “strength of hyperbolicity” of the saddle points.
Equality of pressures for diffeomorphisms preserving hyperbolic measures
Clearly, every periodic point is Lyapunov regular, and thus, ϕu (x) is welldeﬁned for every x ∈ SPer(f ).
Equality of pressures for diffeomorphisms preserving hyperbolic measures
In particular, given a g = f k -invariant hyperbolic measure, for suﬃciently large ℓ ≥ 1 the set SPer(f kℓ) is nonempty.
Equality of pressures for diffeomorphisms preserving hyperbolic measures
***